#include <stdio.h>

int char_lower(int c)
{
  if ((c >= 'A') && (c <= 'Z'))
    c = c + 'a' - 'A';
  return(c);
}

void main(void)
{
  int c;

  c = getchar();
  while (c != EOF)
  {
    putchar(char_lower(c));
    c = getchar();
  }
}