def processArray(arr):
    n = len(arr)
    i = 0
    write_index = 0
 
    while i < n:
        if arr[i] % 10 == 6:
            j = i
            while j < n and arr[j] % 10 == 6:
                j += 1
            if j - i >= 2:
                i = j
                continue
        arr[write_index] = arr[i]
        write_index += 1
        i += 1
 
    return write_index
 
 
if __name__ == "__main__":
    import sys
    data = sys.stdin.read().strip().split()
    arr = []
    for num in map(int, data):
        if num < 0:
            break
        arr.append(num)
 
    new_len = processArray(arr)
    for i in range(new_len):
        print(arr[i])

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