import operator

class ParseError(Exception):
    pass

op = {'+': (0,  operator.add),
           '-': (0,  operator.sub),
           '*': (1,  operator.mul),
           '/': (1,  operator.truediv),
           '^': (2,  operator.pow)}

def parcheck(s):
    c = 0
    for t in s:
        c += (t=="(") -(t==")")
        if c<0:
            return False
    return c == 0

def parse(s):
    if not s:
        return 0
    if s[0] == "(" and s[-1]==")":
        if parcheck(s[1:-1]):
            return parse(s[1:-1])
    if s[0] in "*/^"  or s[-1] in op:
            raise ParseError("Syntax error")
    if any(t in op for t in s):
        m = mi = -1
        c = 0
        for i, t in enumerate(s):
            if t in "()":
                c += (t=="(") - (t==")")
            elif t in op:
                if i and t in "+-" and s[i-1] in op:
                    continue
                if op[t][0] + c*3 <= m or m<0:
                    m,  mi = op[t][0] + c*3,  i
        lv,  rv = parse(s[:mi]),  parse(s[mi+1:])
        return op[s[mi]][1](lv,  rv)
    if s[0] == "(":
        return parse(s[1:])
    if s[-1] == ")":
        return parse(s[:-1])
    try:
        return int(s)
    except:
        raise ParseError("Syntax error")

def calc(s):
    try:
        if parcheck(s):
            if  any(t.isdigit() for t in s) and s.find("()")<0:
                print(parse(s))
            else:
                raise ParseError("Syntax error")
        else:
            raise ParseError("Parentheses mismatch")
    except ParseError as e:
        print(e)
        return