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def num():
n = int(input())
for _ in range (n):
num=input().strip()
if len (num)==10 and num[0] in "7,8,9" and num.isdigit():
print("YES")
else:
print("NO")
num()
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Validating phone numbers
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def num(): n = int(input()) for _ in range (n): num=input().strip() if len (num)==10 and num[0] in "7,8,9" and num.isdigit(): print("YES") else: print("NO") num()