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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Stack;
public class Bracket {
static String checkBracket(String exp) {
Stack<Character> charStack = new Stack<>();
int unmatchedOpeningBracket = 0;
int count = 0;
for (int i = 0; i < exp.length(); i++) {
char c = exp.charAt(i);
if (!Arrays.asList('[', ']', '(', ')', '{', '}').contains(c)) {
count = count + 1;
continue;
}
if (c == '[' || c == '(' || c == '{') {
charStack.push(c);
count = count + 1;
unmatchedOpeningBracket = count;
} else {
if (charStack.empty())
return Integer.toString(i + 1);
char top = charStack.pop();
if ((top == '[' && c != ']') || (top == '(' && c != ')') || (top == '{' && c != '}')) {
return Integer.toString(i + 1);
} else {
unmatchedOpeningBracket = unmatchedOpeningBracket - 1;
}
count = count + 1;
}
}
if (charStack.empty())
return "Success";
else if (unmatchedOpeningBracket > 0) {
return Integer.toString(unmatchedOpeningBracket);
}
return Integer.toString(count);
}
public static void main(String[] args) throws IOException {
InputStreamReader input_stream = new InputStreamReader(System.in);
BufferedReader reader = new BufferedReader(input_stream);
String text = reader.readLine();
System.out.println(checkBracket(text));
}
}
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