#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define df 0

int comp(const void*a,const void*b){
  int x=*((char*)a);
  int y=*((char*)b);
  return x-y;
}

int main(){
  char s[10];
  scanf("%s",s);
  int n=strlen(s);
  qsort(s,n,sizeof(char),comp);
  long int ans=n;
  int i,t=1;
  char pr=s[0];
  for(i=1;i<n;i++){
    ans*=n-i;
    if(pr==s[i])t++; else t=1;
    ans/=t;
    pr=s[i];
  }

  printf("%ld",ans-1);
  return 0;
}


/// confirm df==0 ///