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# Enter your code here. Read input from STDIN. Print output to STDOUTdefis_phone_number(number):if((len(number)==10)&(number[0]in["7","8","9"])&(all([x.isdigit()forxinnumber]))):print("YES")else:print("NO")if__name__=="__main__":N=int(input())for_inrange(N):is_phone_number(input())
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Validating phone numbers
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