全wa？！我下载的测试点本地是对的呀

#include<bits/stdc++.h>
#include<numeric>
using namespace std;

int main()
{
    string sh;
    //cin>>n;
    cin>>sh;
    int a=0,b=0,c=0;
    for(int i=0;i<sh.size();i+=5){
        if(sh[i]=='a'){
            if(sh[i+3]=='a') a=a;
            else if(sh[i+3]=='b') a=b;
            else if(sh[i+3]=='c') a=c;
            else a=sh[i+3]-'0';
        }
        else if(sh[i]=='b'){
            if(sh[i+3]=='a') b=a;
            else if(sh[i+3]=='b') b=b;
            else if(sh[i+3]=='c') b=c;
            else b=sh[i+3]-'0';
        }
        else if(sh[i]=='c'){
            if(sh[i+3]=='a') c=a;
            else if(sh[i+3]=='b') c=b;
            else if(sh[i+3]=='c') c=c;
            else c=sh[i+3]-'0';
        }
    }
    cout<<a<<' '<<b<<' '<<c<<endl;

    return 0;

}