Abbreviation

#include <iostream>
#include <string>
#include <fstream>
using namespace std;

int main(){
 ifstream cin("f.txt");
 int n,t1,t2;
 cin>>n;
 string s,abbreviation1,abbreviation2;
 for (int i =0 ;i<n;++i)
 {
  cin>>t1;
  for (int j = 0;j<t1;++j)
  {
    cin>>s;
    abbreviation1 += s[0];
  }
  cin>>t2;
  for (int k = 0;k<t2;++k)
  {
   cin>>s;
   abbreviation2 += s[0];
  }
  if (abbreviation1.compare(abbreviation2) == 0)
   cout<<"SAME"<<endl;
  else
   cout<<"DIFFERENT"<<endl;
  abbreviation1 = "";
  abbreviation2 = "";
 }
 return 0;
}