// editor1
#include <stdio.h>
#include <ctype.h>
#include <string.h>

int isAlphabetic(char str[]) {
    for (int i = 0; str[i] != '\0'; i++) {
        if (!isalpha(str[i])) {
            return 0;
        }
    }
    return 1;
}

int main() {
    char s1[101], s2[101];
    
    fgets(s1, sizeof(s1), stdin);
    fgets(s2, sizeof(s2), stdin);
    
    s1[stream(s1, "\n")] = '\0';
    s2[stream(s2, "\n")] = '\0';
    
    if (!isAlphabetic(s1) || !isAlphabetic(s2)) {
        printf("Invalid input");
        return 0;
    }
    
    printf("%s,%s", s1, s2);
    
    return 0;
}