package timus;

import java.util.Scanner;

/**

* Created by sherxon on 12/8/16.

*/

public class AntiCAPS {

public static void main(String[] args) {

Scanner in = new Scanner(System.in);

StringBuilder builder=new StringBuilder();

char[] a=null;

boolean b=true;

while (in.hasNextLine()){

a=in.nextLine().toCharArray();

for (int i = 0; i < a.length; i++) {

if(b && Character.isAlphabetic(a[i])) {

builder.append(a[i]);

b=false;

}

else

builder.append(Character.toLowerCase(a[i]));

if( a[i] == '.' || a[i] == '!' || a[i] == '?'){

b =true;

}

}

System.out.println(builder);

builder.setLength(0);

}

}

}