import sys

sys.setrecursionlimit(10 ** 7)
input = sys.stdin.readline
f_inf = float('inf')
MOD = 10 ** 9 + 7


def solve():
    S = input().rstrip()
    res = ""
    prev = None
    for s in S:
        if s == prev:
            continue
        res += s
        prev = s
    print(res)


if __name__ == '__main__':
    solve()