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62 lines
1 KiB
Python
62 lines
1 KiB
Python
def problem_p03854(input_data):
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s = eval(input_data)
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t = ""
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while len(t) < len(s):
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target_len = len(s) - len(t)
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if s[len(t)] == "d":
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if target_len == 5:
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t += "dream"
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elif target_len == 7:
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t += "dreamer"
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elif target_len > 7:
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if s[len(t) + 5] != "d" and s[len(t) + 5 : len(t) + 7 + 1] != "era":
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t += "dreamer"
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else:
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t += "dream"
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else:
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break
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else:
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if target_len == 5:
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t += "erase"
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elif target_len == 6:
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t += "eraser"
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elif target_len > 6:
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if s[len(t) + 5] != "d" and s[len(t) + 5 : len(t) + 6 + 2] != "era":
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t += "eraser"
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else:
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t += "erase"
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else:
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break
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if s[0 : len(t)] != t:
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break
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return "YES" if s == t else "NO"
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