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func isValid(s string) bool {
    stack := []rune{}
    for _, c := range s {
        var cover rune
        switch c {
        case '(', '[', '{':
            stack = append(stack, c)
            continue
        case ')':
            cover = '('
        case ']':
            cover = '['
        case '}':
            cover = '{'    
        }
        if len(stack) == 0 || stack[len(stack)-1] != cover {
            return false
        }
        stack = stack[:len(stack)-1]
    }
    return len(stack) == 0
}