import java.io.*;
import java.util.*;

public class Main {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		int n = sc.nextInt();

//		if (n == 3) {
//			String s = sc.next();
//			if (s.equals("ooo")) {
//				pr.println("SSS");
//			} else if (s.equals("xxx")) {
//				pr.println("WWW");
//			} else {
//				pr.println(-1);
//			}
//		} else {
			char[] s = sc.next().toCharArray();

			StringBuilder[] ans = {new StringBuilder("SS"), new StringBuilder("WW"), new StringBuilder("SW"), new StringBuilder("WS")};
			for (int i = 1; i < n; i++) {
				for (StringBuilder ans1 : ans) {
					if (s[i] == 'o') {
						if (ans1.charAt(i - 1) == 'S' && ans1.charAt(i) == 'S') {
							ans1.append('S');
						} else if (ans1.charAt(i - 1) == 'W' && ans1.charAt(i) == 'W') {
							ans1.append('S');
						} else if (ans1.charAt(i - 1) == 'S' && ans1.charAt(i) == 'W') {
							ans1.append('W');
						} else if (ans1.charAt(i - 1) == 'W' && ans1.charAt(i) == 'S') {
							ans1.append('W');
						}
					} else {
						if (ans1.charAt(i - 1) == 'S' && ans1.charAt(i) == 'S') {
							ans1.append('W');
						} else if (ans1.charAt(i - 1) == 'W' && ans1.charAt(i) == 'W') {
							ans1.append('W');
						} else if (ans1.charAt(i - 1) == 'S' && ans1.charAt(i) == 'W') {
							ans1.append('S');
						} else if (ans1.charAt(i - 1) == 'W' && ans1.charAt(i) == 'S') {
							ans1.append('S');
						}
					}
				}
			}

			for (StringBuilder ans1 : ans) {
				if (ans1.charAt(0) == ans1.charAt(n)) {
					if (s[0] == 'o') {
						if (ans1.charAt(0) == 'S' && ans1.charAt(1) == ans1.charAt(n - 1)) {
							pr.println(ans1.deleteCharAt(n));
							return;
						} else if (ans1.charAt(0) == 'W' && ans1.charAt(1) != ans1.charAt(n - 1)) {
							pr.println(ans1.deleteCharAt(n));
							return;
						}
					} else {
						if (ans1.charAt(0) == 'S' && ans1.charAt(1) != ans1.charAt(n - 1)) {
							pr.println(ans1.deleteCharAt(n));
							return;
						} else if (ans1.charAt(0) == 'W' && ans1.charAt(1) == ans1.charAt(n - 1)) {
							pr.println(ans1.deleteCharAt(n));
							return;
						}
					}
				}
			}
//		}
			pr.println(-1);
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	@SuppressWarnings("unused")
	private static class Scanner {
		BufferedReader br;

		Scanner (InputStream in) {
			br = new BufferedReader(new InputStreamReader(in));
		}

		private boolean isPrintable(int ch) {
			return ch >= '!' && ch <= '~';
		}

		private boolean isCRLF(int ch) {
			return ch == '\n' || ch == '\r' || ch == -1;
		}

		private int nextPrintable() {
			try {
				int ch;
				while (!isPrintable(ch = br.read())) {
					if (ch == -1) {
						throw new NoSuchElementException();
					}
				}

				return ch;
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		String next() {
			try {
				int ch = nextPrintable();
				StringBuilder sb = new StringBuilder();
				do {
					sb.appendCodePoint(ch);
				} while (isPrintable(ch = br.read()));

				return sb.toString();
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		int nextInt() {
			try {
				// parseInt from Integer.parseInt()
				boolean negative = false;
				int res = 0;
				int limit = -Integer.MAX_VALUE;
				int radix = 10;

				int fc = nextPrintable();
				if (fc < '0') {
					if (fc == '-') {
						negative = true;
						limit = Integer.MIN_VALUE;
					} else if (fc != '+') {
						throw new NumberFormatException();
					}
					fc = br.read();
				}
				int multmin = limit / radix;

				int ch = fc;
				do {
					int digit = ch - '0';
					if (digit < 0 || digit >= radix) {
						throw new NumberFormatException();
					}
					if (res < multmin) {
						throw new NumberFormatException();
					}
					res *= radix;
					if (res < limit + digit) {
						throw new NumberFormatException();
					}
					res -= digit;

				} while (isPrintable(ch = br.read()));

				return negative ? res : -res;
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		long nextLong() {
			try {
				// parseLong from Long.parseLong()
				boolean negative = false;
				long res = 0;
				long limit = -Long.MAX_VALUE;
				int radix = 10;

				int fc = nextPrintable();
				if (fc < '0') {
					if (fc == '-') {
						negative = true;
						limit = Long.MIN_VALUE;
					} else if (fc != '+') {
						throw new NumberFormatException();
					}
					fc = br.read();
				}
				long multmin = limit / radix;

				int ch = fc;
				do {
					int digit = ch - '0';
					if (digit < 0 || digit >= radix) {
						throw new NumberFormatException();
					}
					if (res < multmin) {
						throw new NumberFormatException();
					}
					res *= radix;
					if (res < limit + digit) {
						throw new NumberFormatException();
					}
					res -= digit;

				} while (isPrintable(ch = br.read()));

				return negative ? res : -res;
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		float nextFloat() {
			return Float.parseFloat(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		String nextLine() {
			try {
				int ch;
				while (isCRLF(ch = br.read())) {
					if (ch == -1) {
						throw new NoSuchElementException();
					}
				}
				StringBuilder sb = new StringBuilder();
				do {
					sb.appendCodePoint(ch);
				} while (!isCRLF(ch = br.read()));

				return sb.toString();
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		void close() {
			try {
				br.close();
			} catch (IOException e) {
//				throw new NoSuchElementException();
			}
		}
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}


Measured memory_bytes: 31744