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

int main(){
    char s[100];
    int length, i;
    
    fgets(s, sizeof(s), stdin);
    s[strcspn(s, "\n")] = '\0';
    length = strlen(s);
    for(i = 0; i < length; i++){
        if(!isaplha(s[i]) && !isspace(s[i])) {
            printf("Invalid input\n");
            return 0;
        }
    }
    while (length > 0 && isspace(s[length - 1])) {
         s[--length] = '\0';
    }
    int lastWordLength = 0;
    for (i = length - 1; i >= 0; i--){
        if(s[i] == ' ')
           break;
        lastWordLength++;
    }

    printf("%d\n", lastWordLength);
    return 0;
    
}