You need the heat of vaporization to answer the question.
First, you have to calculate the mass of water.
There are three steps to calculate the energy.
[Step1] Cool the steam 122.8℃ → 100℃.
Heat released in this step is
[Step2] Liquefy the steam to liquid water at 100℃.
According to a Japanese site (http://www.hakko.co.jp/qa/qakit/html/h01060.htm),
the heat of vaporization for
[Step3] Cool the liquid water 100℃→21.1℃.
Heat capacity of liquid water is
Heat released in Step3 is
Sum up [Step1] to [Step3] and you find the answer.