#include<stdio.h>

int main(int argc, char **argv){
	// cc stands for current character
	for(char* cc = argv[1]; *cc; cc++){
		if(cc == argv[1] || *(cc - 1) == ' '){
			if(*cc >= 'a' && *cc <= 'z')
				*cc -= ('a' - 'A');
		}
		else {
			if(*cc >= 'A' && *cc <= 'Z')
				*cc += ('a' - 'A');

		}
	}

	puts(argv[1]);
	return 0;
}