Given an array temperatures, return an array answer where answer[i] is the number of days you must wait after day i for a warmer temperature, or 0 if none exists.
Input: one line of space-separated integers. Output: the answer array, space-separated.
73 74 75 71 69 72 76 73
1 1 4 2 1 1 0 0
30 40 50 60
1 1 1 0
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