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

int main()
{
    char s[21];
    int i,len, last_word_len = 0;
    
    fgets(s,21,stdin);
    len=strlen(s);
    if(len>0 && s[len-1] == '\n') s[len-1] = '\0';
    for(i = 0; s[i]; ++i)
    {
        if(!isalpha(s[i]) && s[i] !='')
        {
            printf("Invalid input\n");
            retrun 0;
        }
    }
    len = strlen(s);
    i = len-1;
    while(i >= 0 && s[i] == '')i--;
    while(i >= 0 && s[i] !='')
    {
        last_word_len++;
        i--;
    }
    printf("%d\n", last_word_len);
    return 0;
}