部分A+B

#include"iostream"
using namespace std;

int main() {
    string str1,str2;
    char da,db;
    int pa = 0,pb = 0;
    cin>>str1>>da>>str2>>db;
    for(int i = 0; i < str1.length(); ++i)
        if(str1[i] == da) {
            pa = pa*10+da-‘0‘;
        }
    for(int i = 0; i < str2.length(); ++i)
        if(str2[i] == db) {
            pb = pb*10+db-‘0‘;
        }
    cout<<pa+pb;
    return 0;
}