1 #include <bits/stdc++.h> 2 #define _for(i,a,b) for(int i = (a);i < (b);i ++) 3 #define pb push_back 4 using namespace std; 5 6 int main() 7 { 8 string s; 9 while(cin >> s) 10 { 11 _for(i,0,s.size()) 12 if(!(i&0x1)) 13 cout << s[i]; 14 cout << endl; 15 } 16 return 0; 17 }