0分求助！！

#include<bits/stdc++.h> 
using namespace std;
int a,b,c;
int main()
{
	string s;
	
	cin>>s;
	for(int i=0;i<s.size();i++)
	{
		if(s[i]=='a')
		{
			if(s[i+3]>='a'&&s[i+3]<='z')
			{
				if(s[i+3]=='b')a=b;
				else if(s[i+3]=='c')a=c;
				else if(s[i+3]=='a')a=a;
			}
			else a=s[i+3]-'0';
		}
		if(s[i]=='b')
		{
			if(s[i+3]>='a'&&s[i+3]<='z')
			{
				if(s[i+3]=='a')b=a;
				else if(s[i+3]=='c')b=c;
				else if(s[i+3]=='b')b=b;
			}
			else b=s[i+3]-'0';
		}
		if(s[i]=='c')
		{
			if(s[i+3]>='a'&&s[i+3]<='z')
			{
				if(s[i+3]=='a')c=a;
				else if(s[i+3]=='b')c=b;
				else if(s[i+3]=='c')c=c;
			}
			else c=s[i+3]-'0';
		}
	}
	cout<<a<<" "<<b<<" "<<c;
}