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