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- #include <bits/stdc++.h>
- using namespace std;
- #define PB push_back
- #define ZERO (1e-10)
- #define INF (1<<30)
- #define CL(A,I) (memset(A,I,sizeof(A)))
- #define DEB printf("DEB!\n");
- #define D(X) cout<<" "<<#X": "<<X<<endl;
- #define EQ(A,B) (A+ZERO>B&&A-ZERO<B)
- typedef long long ll;
- typedef pair<ll,ll> pll;
- typedef vector<int> vi;
- typedef pair<int,int> ii;
- #define IN(n) int n;scanf("%d",&n);
- #define FOR(i, m, n) for (int i(m); i < n; i++)
- #define REP(i, n) FOR(i, 0, n)
- #define F(n) REP(i, n)
- #define FF(n) REP(j, n)
- #define FT(m, n) FOR(k, m, n)
- #define aa first
- #define bb second
- void ga(int N,int *A){F(N)scanf("%d",A+i);}
- set<string> S;
- string s,u,v;
- int main(void){
- while(cin>>s)S.insert(s);
- for(auto&s:S){
- F((ll)s.size()-1)
- if(S.count(s.substr(0,i+1))&&S.count(s.substr(i+1))){cout<<s<<endl;break;}
- }
- return 0;
- }
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