#include <iostream>
#include <cstring>
using namespace std;
int st[11],n,c[11];
char cuv[11][15];
void citire()
{
cin>>n;
for(int i=1;i<=n;i++)
{
cin.get();
cin.get(cuv[i],15);
c[i]=strlen(cuv[i]);
}
}
void tipar(int k)
{
for(int i=1;i<=k;i++)
cout<<cuv[i][st[i]];
cout<<endl;
}
int solutie(int k)
{
return (k==n);
}
int valid (int k)
{
return 1;
}
void bktr()
{
int k=1;
st[k]=-1;
while(k)
{
if(st[k]<c[k]-1)
{
st[k]++;
if(valid(k))
if(solutie(k))
tipar(k);
else
{
k++;
st[k]=-1;
}
}
else
k--;
}
}
int main()
{
citire();
bktr();
return 0;
}
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