#include <iostream>
#include <stack>
#include <algorithm>
#include <vector>
//#include <gtest/gtest.h>

using std::string;
using std::stack;

const std::vector<char> brackets = {'[',']','(',')','{','}'};

static string checkBracket(string exp) {
    stack<char> charStack;
    int unmatchedOpeningBracket = 0;
    int count = 0;
    for (int i = 0; i < exp.length(); i++) {
        char c = exp[i];
        if (!(std::find(brackets.begin(), brackets.end(), c) !=brackets.end())) {
            count = count + 1;
            continue;
        }

        if (c == '[' || c == '(' || c == '{') {
            charStack.push(c);
            count = count + 1;
            unmatchedOpeningBracket = count;
        } else {
            if (charStack.empty())
                return std::to_string(i+1);
            char top = charStack.top();
            charStack.pop();
            if ((top == '[' && c != ']') || (top == '(' && c != ')') || (top == '{' && c != '}')) {
                return std::to_string(i+1);
            } else {
                unmatchedOpeningBracket = unmatchedOpeningBracket - 1;
            }
            count = count + 1;
        }
    }
    if (charStack.empty())
        return "Success";
    else if (unmatchedOpeningBracket > 0) {
        return std::to_string(unmatchedOpeningBracket);
    }
    return std::to_string(count);
}

//TEST(CheckBracket, t1) {
//    string exp = "[]";
//    ASSERT_EQ("Success", checkBracket(exp));
//}
//
//TEST(CheckBracket, t2) {
//    string exp = "{}[]";
//    ASSERT_EQ("Success", checkBracket(exp));
//}
//
//TEST(CheckBracket, t3) {
//    string exp = "[()]";
//    ASSERT_EQ("Success", checkBracket(exp));
//}
//
//TEST(CheckBracket, t4) {
//    string exp = "(())";
//    ASSERT_EQ("Success", checkBracket(exp));
//}
//
//TEST(CheckBracket, t5) {
//    string exp = "{[]}()";
//    ASSERT_EQ("Success", checkBracket(exp));
//}
//
//TEST(CheckBracket, t6) {
//    string exp = "{";
//    ASSERT_EQ("1", checkBracket(exp));
//}
//
//TEST(CheckBracket, t7) {
//    string exp = "{[}";
//    ASSERT_EQ("3", checkBracket(exp));
//}
//
//TEST(CheckBracket, t8) {
//    string exp = "foo(bar);";
//    ASSERT_EQ("Success", checkBracket(exp));
//}
//
//TEST(CheckBracket, t9) {
//    string exp = "foo(bar[i);";
//    ASSERT_EQ("10", checkBracket(exp));
//}
//
//TEST(CheckBracket, t10) {
//    string exp = "[](()";
//    ASSERT_EQ("3", checkBracket(exp));
//}
//
//TEST(CheckBracket, t11) {
//    string exp = "{[}haha";
//    ASSERT_EQ("3", checkBracket(exp));
//}
//
//TEST(CheckBracket, t12) {
//    string exp = "haha{[}";
//    ASSERT_EQ("7", checkBracket(exp));
//}

int main() {
    std::string text;
    getline(std::cin, text);

    std::cout << checkBracket(text) << '\n';

    return 0;
}