Replace char occurrences¶

Get a string from a given string where all occurrences of its first char

have been changed to ‘$’, except the first char itself.

Sample String :

‘restart’

Expected Result :

‘resta$t’

def change_char(S):
  char = S[0]
  S = S.replace(char, '$')
  S = char + S[1:]
  return S

# test
print(change_char('restart'))          # resta$t