####
# For python3
####
def gcd( a , b ):
if b == 0:
return a
else:
return gcd ( b , a % b )
t = int(input())
while t != 0:
s = input()
a , b = ( int(x) for x in s.split() )
c = gcd(a,b)
print(c)
t = t - 1
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