#include<cstdio>
long long ans[125];

int main(){
    int T;
    scanf("%d",&T);
    while(T--){
    long long a,b;
    scanf("%lld%lld",&a,&b);
    long long diff = b-a;
    //can use for now
    long long base = 1;
    int size = 0;
    while(base<=diff){
        long long nBase = base*2;
        if(a%nBase){
            diff -= base;
            a += base;
            ans[++size] = base;
        }
        base *= 2;
    }
    int len = 0;
    while(diff!=0){
        if(diff%2) ans[++size] = 1ll<<len;
        len++;
        diff /= 2;
    }
    printf("%d\n",size);
    for(int i = 1; i <= size; i++) printf("%lld ",ans[i]);
    printf("\n");
}
    return 0;
}