include

include

include

int main() {

int t,p=0;

scanf("%d", &t);

while (p<t){

int i,trct;

int atingido=0;

scanf("%d", &trct);

int postr[trct];

char acao[trct];

for (i=0; i<trct; i++)

{

 scanf ("%d", &postr[i]);
}

 scanf("%s", acao);

for (i=0; i<trct; i++) {

 if  ((acao[i] == 'S') && (postr[i] <= 2) || ((acao[i] == 'J') && (postr[i] > 2)))
    atingido++;

}

printf("%d\n", atingido);

p++; }

}