# -*- coding: utf-8 -*-

inf = open('abbr.in', 'r', encoding='utf-8') # encoding -- не обязательный параметр
ouf = open('abbr.out', 'w')
s = inf.readline()
for i in range(len(s)) :
  if ord('A') <= ord(s[i]) and ord(s[i]) <= ord('Z') :
    ouf.write(s[i])