#include<cstdio>
int n, i, j;
char s[100005];
bool a[4][100005];
int main(){
  scanf("%d %s", &n, s);
  a[1][0] = a[2][1] = a[3][0] = a[3][1] = true;
  for(i = 1; i < n; i++) for(j = 0; j < 4; j++)
    a[j][i+1] = a[j][i]^a[j][i-1]^s[i] == 'o';
  for(j = 0; j < 4; j++){
    if(a[j][n] == a[j][0] && a[j][n-1] == a[j][0]^a[j][1]^s[0] == 'o'){
      for(i = 0; i < n; i++) printf("%c", a[j][i] ? 'S' : 'W');
      return 0;
    }
  }
  printf("-1");
}

### Prompt

Please provide a cpp coded solution to the problem described below:

Snuke, who loves animals, built a zoo.

There are N animals in this zoo. They are conveniently numbered 1 through N, and arranged in a circle. The animal numbered i (2≤i≤N-1) is adjacent to the animals numbered i-1 and i+1. Also, the animal numbered 1 is adjacent to the animals numbered 2 and N, and the animal numbered N is adjacent to the animals numbered N-1 and 1.

There are two kinds of animals in this zoo: honest sheep that only speak the truth, and lying wolves that only tell lies.

Snuke cannot tell the difference between these two species, and asked each animal the following question: "Are your neighbors of the same species?" The animal numbered i answered s_i. Here, if s_i is `o`, the animal said that the two neighboring animals are of the same species, and if s_i is `x`, the animal said that the two neighboring animals are of different species.

More formally, a sheep answered `o` if the two neighboring animals are both sheep or both wolves, and answered `x` otherwise. Similarly, a wolf answered `x` if the two neighboring animals are both sheep or both wolves, and answered `o` otherwise.

Snuke is wondering whether there is a valid assignment of species to the animals that is consistent with these responses. If there is such an assignment, show one such assignment. Otherwise, print `-1`.

Constraints

* 3 ≤ N ≤ 10^{5}
* s is a string of length N consisting of `o` and `x`.

Input

The input is given from Standard Input in the following format:


N
s


Output

If there does not exist an valid assignment that is consistent with s, print `-1`. Otherwise, print an string t in the following format. The output is considered correct if the assignment described by t is consistent with s.

* t is a string of length N consisting of `S` and `W`.
* If t_i is `S`, it indicates that the animal numbered i is a sheep. If t_i is `W`, it indicates that the animal numbered i is a wolf.

Examples

Input

6
ooxoox


Output

SSSWWS


Input

3
oox


Output

-1


Input

10
oxooxoxoox


Output

SSWWSSSWWS

### Response

```cpp
#include<cstdio>
int n, i, j;
char s[100005];
bool a[4][100005];
int main(){
  scanf("%d %s", &n, s);
  a[1][0] = a[2][1] = a[3][0] = a[3][1] = true;
  for(i = 1; i < n; i++) for(j = 0; j < 4; j++)
    a[j][i+1] = a[j][i]^a[j][i-1]^s[i] == 'o';
  for(j = 0; j < 4; j++){
    if(a[j][n] == a[j][0] && a[j][n-1] == a[j][0]^a[j][1]^s[0] == 'o'){
      for(i = 0; i < n; i++) printf("%c", a[j][i] ? 'S' : 'W');
      return 0;
    }
  }
  printf("-1");
}

```