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- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- #define test int t; cin>>t; while(t--)
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);cout.tie(0);
- ll n,l,i,j,k;
- string a[1000];
- cin>>n>>l;
- for(i=0;i<n;i++)
- {
- cin>>a[i];
- }
- sort(a,a+n);
- for(i=0;i<n;i++)
- {
- cout<<a[i];
- }
- cout<<endl;
- return 0;
- }
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