#include <bits/stdc++.h>
using namespace std;
#define f(i,k,n) for(int i=k; i<n; i++)
#define ll long long
const int inf = INT_MAX;

void solve()
{
  int n;
  cin>>n;
  set<string> a;
  string x;
  f(i,0,n)  
  {
    cin>>x;
    a.insert(x);
  }  
  int s=a.size()-1;
  int c=1;
  f(i,0,n-s)    c*=(26-s-i);
  cout<<c;
}

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    int t=1;
    //cin>>t;
    while(t--)  solve();
    return 0;
}