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

int main(){
    char[21];
    fgets(s,sizeof(s),stdin);
    s[strcspn(s,"\n")] = 0;// remove newline if present
    
    for(int i =0; s[i];i++){
        if(!salpha(s[i])){
            printf("invalid input|n");
            return 0;
        }
    }
}

int len = strlen(s);
int last_word_len = 0;

for (int i = len - 1;i>=0;i--){
    if (s[i] ==''){
        if (last_word_len>0) break;
    }else{
        last_word_len++;
    }
 }
 printf("%d\n",last_word_len);
 return 0;
}