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def solution(s):
    answer = 0
    bowl_list = []
    bowl = ''
    for i in range(len(s)):
        if s[i].isdigit() == True or s[i] == 'Z' or s[i] == '-':
            bowl += s[i]
        elif s[i] == ' ':
            if bowl == 'Z':
                bowl_list.append(bowl)
            else:
                bowl_list.append(int(bowl))
            bowl = ''
    if bowl.isdigit() == True:
        bowl_list.append(int(bowl))
    else:
        bowl_list.append(bowl)
    for j in range(len(bowl_list)):
        if bowl_list[j] != 'Z':
            answer += bowl_list[j]
        else:
            answer -= bowl_list[j-1]


    return answer