#include<stdio.h>
#include<ctype.h>
#include<string.h>
int main()
{
    char str[200];
    int count=0,isnumber=1;
    fgets(str, sizeof(str),stdin);
    str[strcspn(str, "\n")]='\0';
    for(int i=0;str[i]!=='\0;i++)
    {
        if (isdigit(str[i])&&str[i]!==' ')
        {
            inNumber=0;
            break;
        }
    }
    if(isNumber)
    {
        printf("Invalid input");
    }
    for(int i=0;str[i]!=='\0';i++)
   {
       if(isalpha(str[i]))
        {
        count++;
        }
   }
   printf("%d",count);
}