import java.util.*;
import java.lang.*;
import java.io.*;
 
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(MNStringSolution.findPossibleSmallestNumberMatchingPattern("MNM"));
	}
}
 
 
class MNStringSolution {
	static PriorityQueue<Integer> heap = new PriorityQueue<Integer>();
 
	static int findPossibleSmallestNumberMatchingPattern(String pattern) {
		if (validatePattern(pattern))
			return -1;
		return Integer.parseInt(processString(pattern));
 
	}
 
 
	private static boolean validatePattern(String pattern) {
		return (pattern.equals("") || pattern == "" || pattern == " " || pattern == null
				|| getMNCount(pattern) != pattern.length());
	}
 
	private static int getMNCount(String pattern) {
		int mCount = 0, nCount = 0;
		for (int i = 0; i < pattern.length(); i++) {
			if (pattern.charAt(i) == 'M') {
				mCount++;
			}
			if (pattern.charAt(i) == 'N') {
				nCount++;
			}
		}
		return nCount + mCount;
	}
 
 
	private static String processString(String input) {
		String res = "";
		int len = input.length();
		for (int k = 1; k <= len + 1; k++)
			heap.add(k);
		int mCount = 0;
		int nCount = 0;
		for (int i = 0; i < len; i++) {
			if (input.charAt(i) == 'M') {
				mCount = getConsecutiveCount(input, i, 'M');
				res += getElement(mCount + 1);
				mCount = 0;
			} else {
				res += getElement(1);
				nCount = 0;
			}
 
		}
		return res + heap.poll();
	}
 
	public static int getConsecutiveCount(String input, int index, char ch) {
		int c = 0;
		for (int i = index; i < input.length(); i++) {
			if (input.charAt(i) == ch) {
				c++;
			} else {
				break;
			}
		}
		return c;
 
	}
 
	private static String getElement(int k) {
		PriorityQueue<Integer> pq = new PriorityQueue<Integer>();
		int tmp = 0, c = 0;
 
		while (k-- > 0) {
			tmp = heap.poll();
			c++;
			if (k > 0) {
				pq.add(tmp);
			} else {
				break;
			}
		}
 
		heap.addAll(pq);
		return tmp + "";
	}
 
}

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