change_dict = dict()
change_dict['A'] = "A#"
change_dict['B'] = "C"
change_dict['C'] = "C#"
change_dict['D'] = "D#"
change_dict['E'] = "F"
change_dict['F'] = "F#"
change_dict['G'] = "G#"

S = input()
print(change_dict[S])