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#!/usr/bin/env python3
for _ in range(int(input())):
n, d = input().split()
n, d = [int(x) for x in n], int(d)
for i in range(-1, -1-len(n), -1):
if n[i] > d:
n[i] = d
else:
break
for i in range(i, -len(n), -1):
if n[i] < n[i-1]:
n.pop(i - 1)
n.append(d)
print(''.join(map(str, n)))
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