#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main() {
    char s[101];
    fgets(s, sizeof(s), stdin);
    int len = strlen(s);
    if (s[len - 1] == '\n') {
        s[len - 1] =  '\0';
        len--;
    }
    for(int i = 0; i < len; i++) {
        if (!(isalpha(s[i]) ||
        isspace(s[i]))) {
            printf("invalid input\n");
            return 0;
        }
    }
    while (len> 0 && s[len - 1] =='
    ') {
        len--;
        int lastwordLen = 0;
        for (int i = len -1;i >= 0; i--)
        {
            if (s[i] =='')
            break;
            lastwordLen==;
        }
        printf("%d\n",lastwordLen);
        return 0;
    }
}