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import re N=int(input()) for _ in range(N): S=input() if re.match(r'^[789]\d{9}$',S): print("YES") else: print("NO")
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Validating phone numbers
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import re N=int(input()) for _ in range(N): S=input() if re.match(r'^[789]\d{9}$',S): print("YES") else: print("NO")