def main():
  from sys import stdin
  input=stdin.readline
  s = input()[:-1]
  n = len(s)
  ans = ''
  flag = False
  for i in range(n-1):
    if flag:
      flag = False
      continue
    if s[i] == s[i+1]:
      ans += s[i]
      flag = True
    else:
      ans += s[i]
  if n == 1:
    ans = s
  else:
    if s[-1] != s[-2]:
      ans += s[-1]
  print(ans)
main()