#include<bits/stdc++.h>
using namespace std;
int main()
{
unsigned long long a,n,m,s;
char ch[10000];
scanf("%llu",&n);
while(n--)
{
scanf("%llu %s",&a,&ch);
m=0;
for(int j=0; j<strlen(ch); j++)
{
s=ch[j]-'0';
m = (m*10 + s)%a;
// cout<<m<<endl;
}
printf("%llu\n",m);
memset(ch,'\0',sizeof(ch));
}
}
using namespace std;
int main()
{
unsigned long long a,n,m,s;
char ch[10000];
scanf("%llu",&n);
while(n--)
{
scanf("%llu %s",&a,&ch);
m=0;
for(int j=0; j<strlen(ch); j++)
{
s=ch[j]-'0';
m = (m*10 + s)%a;
// cout<<m<<endl;
}
printf("%llu\n",m);
memset(ch,'\0',sizeof(ch));
}
}
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