using System;

namespace _45Acsharp
{
    class Program
    {
        static int CanWin(string s1, string s2)
        {
            int a, b;
            if (s1[0] == 'r')
                a = 1;
            else if (s1[0] == 'p')
                a = 2;
            else a = 3;

            if (s2[0] == 'r')
                b = 1;
            else if (s2[0] == 'p')
                b = 2;
            else b = 3;

            if (a == 1)
            {
                if (b == 2)
                    return 2;
                if (b == 3)
                    return 1;
            }
            if (a == 2)
            {
                if (b == 3)
                    return 2;
                if (b == 1)
                    return 1;
            }

            if (a == 3)
            {
                if (b == 1)
                    return 2;
                if (b == 2)
                    return 1;
            }
            return 0;
        }

        static void Main(string[] args)
        {
            string s1, s2, s3;
            s1 = Console.ReadLine();
            s2 = Console.ReadLine();
            s3 = Console.ReadLine();
            int c = -1;

            if ((s1[0] != s2[0]) && (s1[0] != s3[0]) && (s2[0] != s3[0]))
            {
                Console.WriteLine("?");
                return;
            }
            if ((s1[0] == s2[0]) && (s1[0] == s3[0]) && (s2[0] == s3[0]))
            {
                Console.WriteLine("?");
                return;
            }
            if ((s2[0] == s3[0]) &&(s1[0] != s2[0]))
            {
                c = CanWin(s1, s2);
                if (c == 0) { Console.WriteLine("?"); return; }
                if (c==2) Console.WriteLine("?");
                else Console.WriteLine("F");
            }
            else if ((s1[0] == s3[0]) && (s2[0] != s3[0]))
            {
                c = CanWin(s2, s3);
                if (c == 0) { Console.WriteLine("?"); return; }
                if (c == 2) Console.WriteLine("?");
                else Console.WriteLine("M");
            }
            else if ((s1[0] == s2[0]) && (s1[0] != s3[0]))
            {
                c = CanWin(s3, s1);
                if (c == 0) { Console.WriteLine("?"); return; }
                if (c == 2) Console.WriteLine("?");
                else Console.WriteLine("S");
            }

        }
    }
}