#!/usr/bin/env python3
import sys

def main():
    S = input()
    ans = [S[0]]
    for i in range(len(S) - 1):
        if S[i] == S[i + 1]:
            continue
        ans.append(S[i + 1])
    print(*ans, sep="")

if __name__ == '__main__':
    main()