#!/usr/bin/python
# -*- coding: utf-8 -*-
#- Author : (DEK) Devendra Kavthekar

# program098:
# Please write a program which accepts a string from
# console and print the characters that have even indexes.

# Example:
# If the following string is given as input to the program:
# H1e2l3l4o5w6o7r8l9d
# Then, the output of the program should be:
# Helloworld

# Hints:
# Use list[::2] to iterate a list by step 2.


def main(data):
    return data[::2]

if __name__ == '__main__':
    print main(raw_input("Input String: "))
