a+aa+aaa+....

#include<stdio.h>
//#include<string.h>
int main() {
int a, n, k, s,q;
s = q = 0;
scanf_s("%d,%d", &a, &n);
for (k = 0; k < n; k++)
{
s = s * 10 + a;
q += s;
}
printf("q=%d", q);
return 0;
}