def solve():
    N, ms = input().strip().split(" ")
    n, m = int(N), int(ms)
    a = (n // m + 1) * m
    ns = str(n + 1)
    for i in range(0, len(ns) - len(ms) + 1):
        v = int(ns[len(ns) - len(ms) - i : len(ns) - i])
        if v < m:
            s = ns[: len(ns) - len(ms) - i] + ms + "0" * i
            a = min(a, int(s))
            break
        if v == m:
            s = ns[: len(ns) - len(ms) - i] + ms + ns[len(ns) - i :]
            a = min(a, int(s))
            break
    print(a)


T = int(input())
while T != 0:
    T -= 1
    solve()

answer.code:1:1: error: ‘def’ does not name a type
    1 | def solve():
      | ^~~