#include<stdio.h>

int main(){
    int num; scanf("%d", &num);
    while(num--){
        long long int n, m, cnt = 0, st = 9;
        scanf("%lld%lld", &n, &m);
        while(st<=m){
            cnt++;
            st = st*10+9;
        }

        printf("%d\n", n*cnt);
    }

    return 0;
}