/*#include<iostream>
#include<string>
#include<vector>
#include<cstdio>
#include<sstream>
#include<algorithm>
#include<cmath>
#include<map>
#include<functional>
#include<queue>
#include<stack>
#include<set>
using namespace std;
int main(){
int n;
cin>>n;
for(int i=0;i<n;i++){
	double x1,y1,x2,y2,x3,y3,x4,y4;
	bool f=0;
	cin>>x1>>y1>>x2>>y2>>x3>>y3>>x4>>y4;
	double yy1=(y2-y1),yy2=y4-y3;
	if(yy1==0)yy1=0.0000001;
	if(yy2==0)yy2=0.0000001;
	double r1=(x2-x1) / (y2-y1);
	double r2=(x4-x3) / (y4-y3);
	if(abs(r1-r2 ) <=0.000001  )f=1;
	if(f)cout<<"YES"<<endl;
	else cout<<"NO"<<endl;
	}
	return 0;
}*/

/*#include<iostream>
#include<string>
#include<vector>
#include<cstdio>
#include<sstream>
#include<algorithm>
#include<cmath>
#include<map>
#include<functional>
#include<queue>
#include<stack>
#include<set>
using namespace std;
int stoi(string x){stringstream ss;ss<<x;int tmp;ss>>tmp;return tmp;}
string itos(int x){stringstream ss;ss<<x;return ss.str();}
char ta[50][50];
int dx[]={1,0,-1,0},dy[]={0,1,0,-1};
char a[]={'R','D','L','U'};
vector<char>ans;
void dfs(int y,int x,char now){
	bool f=1;
	for(int i=0;i<4;i++){
		if(a[i]==now&&ta[y+dy[i]][x+dx[i]]=='1'){
			ans.push_back(a[i]);
			f=1;
			dfs(y+dy[i],x+dx[i],now);
		}
	}
	if(f){
		for(int i=0;i<4;i++){
			if(ta[y+dy[i]][x+dx[i]]=='1'){
				ans.push_back(a[i]);
				dfs(y+dy[i],x+dx[i],a[i]);
			}
		}
	}
}

int main(){


	for(int i=0;i<9;i++){
		for(int j=0;j<4;j++){
			char now;
			cin>>now;
			ta[i][j]=now;
		}
	}
		dfs(0,0,'F');
		for(int i=0;i<ans.size();i++)cout<<ans[i];
		ans.clear();
	return 0;
}*/


#include<iostream>
#include<string>
#include<vector>
#include<cstdio>
#include<sstream>
#include<algorithm>
#include<cmath>
#include<map>
#include<functional>
#include<queue>
#include<stack>
#include<set>
using namespace std;
int stoi(string x){stringstream ss;ss<<x;int tmp;ss>>tmp;return tmp;}
string itos(int x){stringstream ss;ss<<x;return ss.str();}
char ta[8][8];
int main(){
while(cin>>ta[0][0]){
	int y,x;
	bool f=1;
	for(int i=0;i<8;i++){
		for(int j=(i==0);j<8;j++){
			char now;
			cin>>now;
			if(now=='1'&&f){y=i,x=j;f=0;}
			ta[i][j]=now;
		}
	}
	//for(int i=0;i<8;i++){for(int j=0;j<8;j++){cout<<ta[i][j];}cout<<endl;}
	if(ta[y][x+1]=='1'&&ta[y+1][x]=='1'&&ta[y+1][x+1]=='1')cout<<"A";
	
	else if(ta[y+1][x]=='1'&&ta[y+2][x]=='1'&&ta[y+3][x]=='1')cout<<"B";
	
	else if(ta[y][x+1]=='1'&&ta[y][x+2]=='1'&&ta[y][x+3]=='1')cout<<"C";
	
	else if(ta[y][x+1]=='1'&&ta[y+1][x+1]=='1'&&ta[y+1][x+2]=='1')cout<<"E";
	
	else if(ta[y+1][x]=='1'&&ta[y+1][x+1]=='1'&&ta[y+2][x+1]=='1')cout<<"F";
	
	else if(ta[y][x+1]=='1'&&ta[y+1][x]=='1'&&ta[y+1][x-1]=='1')cout<<"G";
	
	else if(ta[y+2][x-1]=='1'&&ta[y+1][x]=='1'&&ta[y+1][x-1]=='1')cout<<"D";

	cout<<endl;
		for(int i=0;i<8;i++)for(int j=0;j<8;j++)ta[i][j]='0';
}
	
	return 0;
}