/* This is an answer to sf24.txt. */

#include <stdio.h>
#include <ctype.h>

int main(void)
{
  int startsentence = 1;
  char c;

  while (scanf("%c",&c) == 1) {
    if (startsentence)
      putchar(toupper(c));
    else
      putchar(tolower(c));
    switch (c) {
      default: startsentence = 0; break;
      case '.': startsentence = 1; break;
      case ' ': case '\n': ;
    }
  }
  return 0;
}