#include<iostream> using namespace std; int main() { int n; char c[55]; scanf("%d",&n); for(int i=1;i<=n;i++) { scanf("%s",c); int j=0; while(c[j]!='\0'){ if(j%2==0) cout<<c[j+1]; else cout<<c[j-1]; j++; } } cout<<endl; return 0; }