#!/usr/bin/python
# -*- coding: utf-8 -*-
"""Minimal Markov text generator."""
import sys
import random

def pairs(seq):
    seq = iter(seq)
    last = seq.next()
    for item in seq:
        yield last, item
        last = item

def index(pairs):
    return dict((k, [t for t in pairs if t[0] == k])
                for k in set(t[0] for t in pairs))

if __name__ == '__main__':
    model = index(list(pairs(sys.stdin.read())))
    c = model.keys()[0]
    for ii in range(1024):
        sys.stdout.write(c)
        _, c = random.choice(model[c])