//#include <bits/stdc++.h>
#include <iostream>
#include <cstdio>
#include <ctime>
#include <cctype>
#include <queue>
#include <deque>
#include <stack>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cstring>
#include <string>
#include <ctime>
#include <cmath>
#include <cctype>
#include <cstdlib>
#include <queue>
#include <deque>
#include <stack>
#include <vector>
#include <algorithm>
#include <utility>
#include <bitset>
#include <set>
#include <map>
#define ll long long
#define db double
#define INF 5000000000000000ll
#define inf 1000000000
#define ldb long double
#define pb push_back
#define put_(x) printf("%d ",x);
#define get(x) x=read()
#define putl(x) printf("%lld\n",x)
#define rep(p,n,i) for(int i=p;i<=n;++i)
#define go(x) for(int i=lin[x],tn=ver[i];i;tn=ver[i=nex[i]])
#define pii pair<int,int>
#define mk make_pair
#define P 1000000007ll
#define gf(x) scanf("%lf",&x)
#define pf(x) ((x)*(x))
#define uint unsigned long long
#define ui unsigned
#define sq sqrt
#define l(w) t[w].l
#define r(w) t[w].r
#define m(w) t[w].m
#define mn(w) t[w].mn
#define c(w) t[w].c
#define s(w) t[w].s
#define tag(w) t[w].tag
#define S second
#define mod 1000000007
#define sc(A) scanf("%d",&A)
#define scs(A) scanf("%s",A);
#define put(A) printf("%d\n",A)
#define zz p<<1
#define yy p<<1|1
#define fep(p,n,cc) for(int cc=p;cc>=n;--cc)
#define scl(A) scanf("%lld",&A)
#define LL __int128
using namespace std;
const int MAXN = 40;
int T;
ll x, k;
int f[MAXN];
int g[MAXN];
LL F[MAXN][MAXN];
LL ans[MAXN];

void wri(LL x) {
	if (!x)
		return;
	wri(x / 10);
	putchar(x % 10 + '0');
}

int main() {
	//freopen("1.in", "r", stdin);
	sc(T);
	ans[0] = 1;
	while (T--) {
		scl(x);
		scl(k);
		int lim = 37;

		rep(0, 37, i) {
			g[i] = x % 10;
			x /= 10;
			if (i >= 1)
				ans[i] = ans[i - 1] * 10;
			//wri(ans[i]);
			//cout << g[i] << endl;
		}

		//wri(ans[1]);
		if (k == 0) {
			//cout << "ww" << endl;
			rep(0, lim, i) {
				if (g[i] != 9) {
					wri(ans[i]);
					break;
				}
			}
			puts("");
			continue;
		}
		//cout << "ww" << endl;
		fep(37, 0, i) {
			if (g[i + 1] == 9)
				f[i] = f[i + 1] + 1;
			else
				f[i] = 1;
		}
		LL ww = 1, bb;
		rep(1, lim, i)ww = ww * 10;
		rep(0, lim, i)rep(1, 18, j)F[i][j] = ww;
		int bv = -1;
		rep(0, 38, k)if (g[k]) {
			bv = k - 1;
			break;
		}
		fep(lim, 0, i) {
			//if(g[i]==0)continue;
			if (i <= bv)
				continue;
			rep(1, lim, j) {
				if (j >= f[i]) {
					rep(i + f[i] + 1, lim, k) {
						if (g[j - f[i]])
							F[i][j] = min(F[i][j], F[k][j - f[i]] + (10 - g[i]) * ans[i]);
					}
					if (j - f[i] == 0) {
						F[i][j] = min(F[i][j], F[i + f[i]][j - f[i]] + (10 - g[i]) * ans[i]);
					} else
						F[i][j] = min(F[i][j], F[i + f[i]][j - f[i]] + (10 - g[i]) * ans[i] - ans[i + f[i]]);
				}
			}
		}
		rep(0, lim, i)if (g[i])
			ww = min(ww, F[i][k]);
		wri(ww);
		puts("");
	}
	return 0;
}