What is the difference in the weighted-average grant date fair value between granted and forfeited RSUs?
{"Unvested RSUs at December 31, 2018": {"Number of shares": 10623.0, "Weighted-Average Grant Date Fair Value": 40.39}, "Granted": {"Number of shares": 4426.0, "Weighted-Average Grant Date Fair Value": 45.55}, "Vested": {"Number of shares": -2758.0, "Weighted-Average Grant Date Fair Value": 47.86}, "Forfeited": {"Number of shares": -2963.0, "Weighted-Average Grant Date Fair Value": 54.61}, "Unvested RSUs at December 31, 2019": {"Number of shares": 9328.0, "Weighted-Average Grant Date Fair Value": 32.6}}
forfeited_weighted_average_grant_date_fair_value = df["Forfeited"]["Weighted-Average Grant Date Fair Value"]
granted_weighted_average_grant_date_fair_value = df["Granted"]["Weighted-Average Grant Date Fair Value"]
answer = forfeited_weighted_average_grant_date_fair_value - granted_weighted_average_grant_date_fair_value