# -*- coding: utf-8 -*-
"""
Created on Mon Mar 19 18:18:27 2018
@author: stkarlos
"""
s = raw_input(" dose mia leksi: ")
print s
print s[0] + s[-4]
print s[1:-4] + s[-3:]
print s[0::2]
print s.count('A')
print ' i lekse %s periexei %d fores to xaraktira "A" ' %(s, s.count('A') )