#include <stdio.h>



int main(){

printf("Enter the  text, please: ");

int c;
while(( c = getchar()) != EOF){
if( c >= 'a' && c <= 'z'){
    c = c - 32;
}else if( c >= 'A' && c <= 'Z'){
    c = c + 32;
}
    if(c != '\n'){
        if(c >= 32 && c <=126){
            putchar(c);
        }
        }else{
            putchar('\n');
        }
    
}
        
    return 0;
}