#include <iostream>

#include <string>

#include <stack>

#include <iterator>

struct iset

{

int index;

char ch;

};

int check_brackets(std::string const & str)

{

std::stack<struct iset> stack;

auto i = str.begin();

for (struct iset c; i < str.end(); ++i)

{

c.ch = *i;

c.index = i+1 - str.begin();

if (c.ch == '{' || c.ch == '(' || c.ch == '[')

stack.push(c);

else if (c.ch == '}' || c.ch == ')' || c.ch == ']')

{

if (stack.empty())

return ++i - str.begin();

if (c.ch == '}' && stack.top().ch != '{')

return ++i - str.begin();

else if (c.ch == ')' && stack.top().ch != '(')

return ++i - str.begin();

else if (c.ch == ']' && stack.top().ch != '[')

return ++i - str.begin();

else

stack.pop();

}

}

if (!stack.empty())

return stack.top().index;

return -1;

}

int main(void)

{

std::string str;

std::cin >> str;

int ret = 0;

if ((ret = check_brackets(str)) >= 0)

std::cout << ret << std::endl;

else

std::cout << "Success" << std::endl;

return 0;

}