第5讲7*

#include <iostream>

using namespace std;

int main()
{
    string s, s1, s2;

    //*读入
    char c;
    while(cin >> c, c != ',')  s += c;
    while(cin >> c, c != ',')  s1 += c;
    while(cin >> c)  s2 += c;

    if(s.size() < s1.size() || s.size() < s2.size()) cout << "-1" << endl;
    else
    {
        //s1的起点l
        int l = 0;  //从开始开始枚举
        while(l + s1.size() <= s.size())  
        {
            int k = 0;
            while (k < s1.size())
            {
                if(s[l + k] != s1[k]) break;
                k++;
            }
            if(k == s1.size()) break;  //*验证是否相同
            l++;
        }

        //s2的起点r
        int r = s.size() - s2.size();  //从最后开始枚举
        while(r >= 0)
        {
            int k = 0;
            while (k < s2.size())
            {
                if(s[r + k] != s2[k]) break;
                k++;
            }
            if(k == s2.size()) break;
            r--;
        }

        //s1的末尾
        l += s1.size() - 1;
        //s2的开始 r
        //s1 必须在 s2的左边
        if(l >= r) cout << "-1" << endl;
        else
        {
            cout << r - l -1 << endl;
        }
    }
    return 0;
}