#include<iostream>

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