#include<iostream>
#include<stdio.h>

int main() {
    char i[50],*k;
    printf("Input:  ");
    scanf("%s", i);
    k=i;
    while(*k!='\0'){
        if(*k>=97&&*k<=122){
            *k=*k-32;
        }
        else if(*k>=65&&*k<=90){
            *k=*k+32;
        }
        k++;
    }
    printf("Output: ");
    printf("%s\n", i);
    return 0;
    }