#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ char a[100]; int c,i; cin>>a; c=strlen(a); for(i=0;i<c;i+=3){ cout<<a[i]; } cout<<endl; return 0; }