What is the difference in the foreign exchange forward contracts for hedging instruments between other assets and other liabilities?
{"Derivatives designated as hedging instruments:    -- Foreign exchange forward contracts": {"Prepaid Expenses and Other Current Assets": 226, "Other Assets": 139, "Other Current Liabilities": 369, "Other Liabilities": 230}, "Derivatives designated as hedging instruments:    -- Total derivatives designated as hedging instruments": {"Prepaid Expenses and Other Current Assets": 226, "Other Assets": 139, "Other Current Liabilities": 369, "Other Liabilities": 230}, "Derivatives not designated as hedging instruments: -- Foreign exchange forward contracts": {"Prepaid Expenses and Other Current Assets": 973, "Other Assets": "$\u2014", "Other Current Liabilities": 1807, "Other Liabilities": "$\u2014"}, "Derivatives not designated as hedging instruments: -- Interest rate swap contracts .": {"Prepaid Expenses and Other Current Assets": "\u2014", "Other Assets": "\u2014", "Other Current Liabilities": 406, "Other Liabilities": 7209}, "Derivatives not designated as hedging instruments: -- Total derivatives not designated as hedging instruments .": {"Prepaid Expenses and Other Current Assets": 973, "Other Assets": "$\u2014", "Other Current Liabilities": 2213, "Other Liabilities": 7209}, "Derivatives not designated as hedging instruments: -- Total derivative instruments .": {"Prepaid Expenses and Other Current Assets": 1199, "Other Assets": 139, "Other Current Liabilities": 2582, "Other Liabilities": 7439}}
hedging_fx_forward_other_assets = df["Derivatives designated as hedging instruments:    -- Foreign exchange forward contracts"]["Other Assets"]
hedging_fx_forward_other_liabilities = df["Derivatives designated as hedging instruments:    -- Foreign exchange forward contracts"]["Other Liabilities"]
answer = hedging_fx_forward_other_assets - hedging_fx_forward_other_liabilities