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1496.cpp
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1496.cpp
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// Author : Mars_Coder
#define _USE_MATH_DEFINES
#include<bits/stdc++.h>
using namespace std;
#define ln "\n" // no flush, oppos of endl
#define _flush endl
#define stop_sync ios::sync_with_stdio(false) // not to use c-stye io
#define untie_ios cin.tie(nullptr) // no flush
#define lli long long int
#define vi vector<int>
#define vii vector<lli>
#define vss vector<string>
#define pb push_back
#define ppb pop_back
#define sz(x) ((x).size())
#define all(x) (x).begin(), (x).end()
#define bin_sc(a, x) binary_search(all(a), x)
#define lbd(a, x) lower_bound(all(a), x) // an iter.
#define ubd(a, x) upper_bound(all(a), x) // an iter.
#define eq_seg(a, x) equal_range(all(a), x) // a pair of lb, ub
#define FIXED(x) cout << fixed << setprecision(x)
const long double PI = acos(-1.0L);
int main(void){
#ifndef ONLINE_JUDGE
//freopen("generator.txt", "r", stdin);
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
freopen("error.txt", "w", stderr);
#endif
int n;
cin >> n;
string s;
map<string, int> spammer;
for(int i = 0; i < n; ++i){
cin >> s;
++spammer[s];
}
for(auto i: spammer){
if(i.second >= 2){
cout << i.first << ln;
}
}
return 0;
}
/*
some familiar issues:
----> [look at global variables and their values]
*/