题解

#include<iostream>
#include<string>
using namespace std;
int main()
{
	int T;
	cin>>T;
	string n="";
	for (int i=0;i<T;i++)
	{
		n="";
		cin>>n;
		bool flag=false;
		if ((n[n.length()-1]-'0')%2==0)
		{
			cout<<0<<endl;
		}
		else if ((n[0]-'0')%2==0)
		{
			cout<<1<<endl;
		}
		else
		{
			for (int j=1;j<n.length()-1;j++)
			{
				if ((n[j]-'0')%2==0)
				{
					flag=true;
					break;
				}
			}
			if (flag)
			{
				cout<<2<<endl;
			}
			else
			{
				cout<<-1<<endl;
			}
		}
	}
	return 0;
}