#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main(){
    char str[101];
    int length=0, i, lastWordLength=0;
    fgets(str, sizeof(str), stdin);
    str[strcspn(str, "\n")]= '\0';
    length = strlen(str);
    for(i=0;i<length;i++){
        if(!isalpha(str[i]) && str[i] != ' '){
            printf("Invalid input\n");
        }
    }
    i = length-1;
    while(i>=0 && str[i] != ' ')
        i--;
    while(i>=0 && str[i] != ' ')
        lastWordLength++;
        i--;
    }
    printf("%d\n", lastWordLength);
    return 0;
}