In this task, you are given an article. Your task is to summarize the article in a sentence.
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Question: Media playback is not supported on this device
The visitors claimed six wickets for just 38 runs on day five to win the first Test in Durban.
England regained the Ashes this summer but lost to Pakistan last month, winning six of their 14 Tests in 2015.
"Potentially this team can do some really good things," Cook said.
"There's so much talent in this side but it will take relentless hard work."
Cook said the tourists will have to guard against a South Africa backlash in the next match, starting on Saturday in Cape Town, where England have not won since 1957.
"It can turn very quickly. They have world-class players so we can't get too carried away," he said.
"But it would be nice to get our noses ahead again and to continue to put pressure on South Africa."
Nick Compton's grandfather Denis played in that 1957 victory by 312 runs, and Cook was full of praise for the current England number three's patient 85 from 236 balls in Durban. He had been out of the Test team since May 2013.
"The way Nick played really set up the first innings," Cook said. "He was a rock for us in that first innings. From that moment on, the guys bowled particularly well to take 20 wickets and we scored enough runs in the second innings."
James Anderson, England's leading Test wicket-taker, missed the Durban Test with a calf injury, but was seen bowling at the ground before the final day began.
Asked about the swing bowler's chances of being fit for Cape Town, Cook said: "He has had a tough week, bowling a lot and doing rehab. Hopefully he'll be fit.
"He is hopeful of playing and it's looking good but we'll know in the next 48 hours.
"We know what a strong side South Africa are in home conditions - but we're really prepared for this tour."
Meanwhile, England wicketkeeper-batsman Jonny Bairstow was delighted to claim the team's first stumping for 38 Test matches when he dismissed Temba Bavuma, having spilled a chance to stump AB de Villiers the previous day.
"It doesn't necessarily make up for it because I was desperately disappointed to miss it. You work so hard on your game that when the opportunity arises you like to take it," he told BBC Test Match Special.
"To get another one and get into the game was really pleasing and something I can take forward."
Asked about South Africa's batting frailties, he said: "They are not the number one side in the world for nothing and have proven over a long period how good they are.
"We've got to be mentally and physically prepared for what is going to be a very tough battle in the New Year Test match."

Answer: England have taken "big strides forward over the last eight months", said captain Alastair Cook after his side eased to a 241-run victory in South Africa on Wednesday.


Question: A motion was put forward at the bank's annual meeting and needed 75% of shareholders to vote in favour.
However only 64.7% of those present backed the plan, with the German government using its 17% voting stake to vote against it.
Commerzbank was rescued by the government in 2008.
Under new rules introduced by the European Union in the wake of the financial crisis, shareholder approval is needed for any bonus plan that exceeds an employee's base salary.
The finance ministry said the bank had failed to provide a convincing explanation for why such a bonus was needed.
However it did approve a separate proposal to allow certain executives to receive compensation worth 140% of their pay.
This "sets sensible incentives to reach targets and successfully implement strategic goals that the federal government will ultimately benefit from", it said in a statement.
Separately, Commerzbank said it would launch an internal investigation into the actions that led to it paying a $1.45bn settlement in the US for violating economic sanctions against businesses in Iran and Sudan.

Answer: The German government has blocked a plan by Commerzbank to pay bonuses to its top staff worth double their basic salary.


Question: Digitonomy Ltd sent over five million unsolicited messages encouraging people to apply for cash loans via affiliates.
Investigating 1,464 complaints about the texts made between April 2015 and February 2016, the Information Commissioner's Office (ICO) found the company could not prove it had consent.
A company spokesman apologised to those people who found the texts "unwelcome".
The ICO's investigation revealed the company had used affiliates to send the messages and claimed they had proof of consent.
The ICO's head of enforcement Steve Eckersley said the wording of the consent examples were not sufficient and businesses that rely on direct marketing "must be able to confirm that people have given their permission to receive text messages".
"Depending on the word of another company is simply not acceptable and is not an excuse," he said.
A spokesman for Digitonomy said the company was "sorry that a reported 0.03% of recipients found the marketing messages from our appointed affiliate management company last year unwelcome".
He added that the company remained "determined to operate at all times within both the spirit and the letter of the law and best practice".

Answer:
A Chester credit broker has been fined £120,000 for sending millions of text messages without permission.


