There are two lists. Write a function that looks for matching values of these two lists and replaces them with replacing_num (but without touching the first one) stnums = ['4004'] students = [ ['0001', 'Antonov', 'Anton', 'Igorevich', '20.08.2009', 'BST161'], ["1102", "Bogov", "Artem", "Igorevich", "25.01.2010", "BST162"] ["0333", "Glagoleva", "Anastasiya", "Nikolaevna", "11.07.2009", "BST163"] ["4004", "Stepanova", "Natalia", "Aleksandrovna", "13.02.2008", "BST161"] ["0045", "Bokov", "Igor", "Kharitonovich", "02.06.2009", "BST161"], ["0096", "Vasil'kov", "Valentin", "Sergeevich", "20.03.2009", "BST164"], ["0607", "Siropova", "Violetta", "Eduardovna", "28.05.2010", "BST162"], ["4004", "Potapov", "Dmitry", "Stanislavovich", "14.02.2012", "BST161"] ] replacing_num = '9090'

def replace(students, stnums):
  for student in students:
    if student[0] in stnums:
      student[0] = replacing_num
  return students