class M{
  static long c
(int a,
String b
){for(long n
=2,i,x
;;n
++){for(x
=n,i
=2;i
<x
;x
=x
%i
++<1?0:x
);if(x
>1&(n
+"").
length()==a
&(n
+"").
matches("["+b
+"]+"))return n
;}}  
  public static void main
(final String[] a
) {     System.
out.
println(c
(4, 
"12"));     //System.out.println(c(10, "047"));
    System.
out.
println(c
(6, 
"555555555515555555555"));   }
}
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