mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    S = input().rstrip('\n')
    ans = [S[0]]
    for i in range(1, len(S)):
        if S[i] != S[i-1]:
            ans.append(S[i])
    print("".join(ans))


if __name__ == '__main__':
    main()