#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#define ll long long
#define str string
#define pb push_back
#define pf push_front
#define in insert
#define all(v) v.begin(),v.end()
const int sz=1000000,INF=1000000000;
using namespace std;
void solve()
{
str s;
cin>>s;
for(int i=0;i<s.size()/2;i++)
{
cout<<s[i];
}
cout<<" ";
for(int i=s.size()/2;i<s.size();i++)
{
cout<<s[i];
}
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(nullptr),cout.tie(nullptr);
ll t=1;
//cin>>t;
while(t--)
{
solve();
}
}
