#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>

int main(int argc, char *argv[]) {
    char *ch;
    if (argc<2) exit(0);
    
    ch=argv[1];
    while (*ch) {
	printf("%c",tolower(*ch));
	ch++;
    }
    printf("\n");
    return 0;
}