#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(!isalpha(s[i])&&!sspace(s[i])){
           printf("Inva;id input\n");
           return 0;
       }
   }
        while(length>0&&isspace(s[lenght-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;
}