#include<stdio.h>

int main(int argc, char **argv){
	char* our_string = argv[1];
	
	for(int i = 0; our_string[i]; i++){
		if(i == 0 || our_string[i-1] == ' '){
			if(our_string[i] >= 'a' && our_string[i] <= 'z')
				our_string[i] -= ('a' - 'A');
		} else {
			if(our_string[i] >= 'A' && our_string[i] <= 'Z')
				our_string[i] += ('a' - 'A');
		}
	}
	puts(our_string);
	return 0;
}