#include <stdio.h>

int main(){
	char str[] = "AbcDEfg";
	char *p = str;
	
	while(*p != '\0'){
		if(*p >= 'a' && *p <= 'z'){
			*p -= 32;
		}else{
			*p += 32;
		}
		p++;
	}
	puts(str);

	return 0;
}