kitwexin

arr2 = []

with open("input.txt",'r') as message:
    for line in message:
        arr = list(line)
        i = 0
        while i < len(arr):
	        if i == len(arr)-1 or arr[i] != arr[i+1]:
	            arr2.append(arr[i])
              i += 1
	        else:
              i += 2
print(arr2)