16 lines
320 B
Python
16 lines
320 B
Python
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def main():
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n, d = map(int, input().split())
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a = [int(i) for i in input()]
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for c in range(len(a)):
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i = a[c]
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if i < d:
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a.insert(c, d)
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return "".join([str(b) for b in a])
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return "".join([str(b) for b in a])+str(d)
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for _ in range(int(input())):
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print(main())
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