#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main() {
    char description[101];
    fgets(description, sizeof(description), stdin);
    description[strcspn(description, "\n")] = 0; //remove newline if present
    int isNumeric = 1;
    for (int i = 0; description[i]; i++) {
        if (!isdigit(description[i])) {
            isNumeric = 0;
            break;
        }
}
if (isNumeric {
    printf("Invalid Input\n");
}else {
    printf("%zu\n", strlen(description));
}
return 0;
}