import sys
import math
from math import sin, cos, tan
from functools import reduce
from collections import deque
import heapq
sys.setrecursionlimit(1000000)
intm1 = lambda x:int(x)-1

S = input()
N = len(S)
T = S[0]
i = 1
while i < N:
	if S[i] == T[-1]:
		i += 1
		continue
	T += S[i]
	i += 1
print(T)