using System;
using System.Collections.Generic;
using System.Text;

    public class Program
    {
        private static Dictionary<char, char> Symbols = new Dictionary<char, char>()
        {
            { '[', ']'},
            { ']', '['},
            { '(', ')'},
            { ')', '('},
            { '}', '{'},
            { '{', '}'},
        };

        private static Stack<char> SymbolStack = new Stack<char>();

        private static bool IsBracket(char InChar)
        {
            return Symbols.ContainsKey(InChar);
        }

        private static bool IsCloseBracket(char InChar)
        {
            return InChar == ']' || InChar == '}' || InChar == ')';
        }

        private static bool IsOpenBracket(char InChar)
        {
            return InChar == '[' || InChar == '{' || InChar == '(';
        }

        public static string Check(string Input)
        {
            if (Input == null || Input.Length == 0)
            {
                return "1";
            }

            SymbolStack.Clear();

            StringBuilder CustomString = new StringBuilder(Input);

            for (int I = 0; I < Input.Length; ++I)
            {
                char Symbol = CustomString[I];

                if (!IsBracket(Symbol)) continue;

                if (IsOpenBracket(Symbol))
                {
                    SymbolStack.Push(Symbol);
                }

                if (IsCloseBracket(Symbol))
                {
                    if (SymbolStack.Count > 0 && Symbols[SymbolStack.Peek()] == Symbol)
                    {
                        SymbolStack.Pop();
                    }
                    else
                    {
                        return (I + 1).ToString();
                    }
                }
            }

            if (SymbolStack.Count > 0)
            {
                if (IsOpenBracket(SymbolStack.Peek()))
                {
                    return (Input.IndexOf(SymbolStack.Peek()) + 1).ToString();
                }
                else
                {
                    return Input.Length.ToString();
                }
            }

            return "Success";
        }



        public static void Main()
        {

                string Input = Console.ReadLine();

                Console.WriteLine(Check(Input));

        }
    }