#include <stdio.h>
int main(void){
    char str[100];
    int i;
    int code = 0;
    scanf( "%s", str );
    for( i = 0; i < 100; i++ ){
        if( str[i] == '\0' ){
            break;
        }
        code = ( int )str[i];
        if( code >= 97 ){
            code -= 32;
        }else{
            code += 32;
        }
        printf( "%c", code );
    }
    printf( "\n" );
}