const std = @import("std");

pub fn main() !void {
    const stdin = std.io.getStdIn();
    var buf_io = std.io.bufferedReader(stdin.reader());
    var reader = buf_io.reader();

    var buf = [_]u8{0} ** 100000;
    _ = try reader.readAll(&buf);

    std.debug.print("{}", .{calculate_floor(&buf)});
}

fn calculate_floor(instructions: []const u8) i32 {
    var current: i32 = 0;
    var i: i32 = 1;

    for (instructions) |c| {
        switch (c) {
            0 => break,
            '(' => current += 1,
            ')' => current -= 1,
            else => continue,
        }
        if (current < 0) {
            return i;
        }
        i += 1;
    }

    return -1;
}

test "day-tests" {
    try std.testing.expectEqual(calculate_floor(")"), 1);
    try std.testing.expectEqual(calculate_floor("()())"), 5);
}