// editor2
#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main(){
    char s[100];
    fgets(s, sizeof(s), stdin);
    s[strcspn(s, "\n")] = '\0';
    for(int i = 0; s[i] != '\0'; i++){
        if (!isalpha(s[i]) && s[i] != ' '){
            printf("Invalid input");
            return 0;
        }
        int len = len - 1;
        while (i >=0 && s[i] == ' '){
            i--;
        }
        while (i >=0 && s[i] != ' '){
            count ++;
            i--;
        }
        printf("%d", count);
        return 0;
    }
}