#include <bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define FOR(i,a,b) for (auto i = (a); i <= (b); ++i)
#define NFOR(i,a,b) for(auto i = (a); i >= (b); --i)
#define all(x) (x).begin(), (x).end()
#define sz(x) int(x.size())
#define mp(i,a) make_pair(i,a)
#define pb(a) push_back(a)
#define bit(x,b) (x&(1LL<<b))
typedef int lli;
typedef pair <lli,lli> ii;
typedef pair <lli,ii> iii;
typedef vector <lli> vi;
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int test=1;
for(;test>0;--test)
{
string s;
cin>>s;
int i=0,n=s.size();
for(i=0;i<n/2;++i)
cout<<s[i];
cout<<' ';
for(;i<n;++i)
cout<<s[i];
cout<<endl;
}
return(0);
}
