class Solution {
public:
    vector<string> cellsInRange(string s) {
        char c1=s[0], r1=s[1], c2=s[3], r2=s[4];
        vector<string> v;
        for(int i=0;i+c1<=c2;i++)
        {
            for(int j=0;j+r1<=r2;j++)
            {
                string p;
                p+=(c1+i);
                p+=(r1+j);
                v.push_back(p);
            }
        }
        return v;
    }
};