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#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;
}
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