# 12613 - Yet Another Meme Problem
## 題解:
a⋅b + a + b = a⋅10^|b| + b
b + 1 = 10^|b|
因此b只會是999...999，先將長度算出來，答案就是乘於a。
## Code:

#include <stdio.h>
#define ll long long int

ll t, a, b;

int getLen(int x){
    int res = 0;
    while(x){
        res++;
        x /= 10;
    }
    return res;
}

int main(){
    scanf("%lld", &t);
    while(t--){
        scanf("%lld%lld", &a, &b);
        int len = getLen(b + 1);
        ll ans = a * (len - 1);
        printf("%lld\n", ans);
    }
    return 0;
}

###### tags: `NTHUOJ`