Go: package main

import (
	"bufio"
	"os"
	"strings"
	"strconv"
	"reflect"
	"fmt"
)

var scanner = bufio.NewScanner(os.Stdin)

func scanBoard() [][]int {
	ret := make([][]int, 8)
	for k := range ret {
		ret[k] = make([]int, 8)
		for l := range ret[k] {
			ret[k][l] = 0
		}
	}
	for i := 0; i < 8; i++ {
		scanner.Scan()
		row := strings.Split(scanner.Text(), "")
		for j := 0; j < 8; j++ {
			ret[i][j], _ = strconv.Atoi(row[j])
		}
	}
	return ret
}

func main() {
	for {
		var board [][]int
		var ans string
		if board = scanBoard(); reflect.DeepEqual(board, [][]int{}) {
			break
		}
		fmt.Println(board)
		for i := 0; i < 8; i++ {
			for j := 0; j < 8; j++ {
				if board[i][j] == 1 && board[i+1][j] == 1 && board[i][j+1] == 1 && board[i+1][j+1] == 1 {
					ans = "A"
				}
			}
		}
		for i := 0; i < 8; i++ {
			for j := 0; j < 8; j++ {
				if board[i][j] == 1 && board[i+1][j] == 1 && board[i+2][j] == 1 && board[i+3][j] == 1 {
					ans = "B"
				}
			}
		}
		for i := 0; i < 8; i++ {
			for j := 0; j < 8; j++ {
				if board[i][j] == 1 && board[i][j+1] == 1 && board[i][j+2] == 1 && board[i][j+3] == 1 {
					ans = "C"
				}
			}
		}
		for i := 0; i < 8; i++ {
			for j := 0; j < 8; j++ {
				if board[i][j+1] == 1 && board[i+1][j] == 1 && board[i+1][j+1] == 1 && board[i+2][j] == 1 {
					ans = "D"
				}
			}
		}
		for i := 0; i < 8; i++ {
			for j := 0; j < 8; j++ {
				if board[i][j] == 1 && board[i][j+1] == 1 && board[i+1][j+1] == 1 && board[i+1][j+2] == 1 {
					ans = "E"
				}
			}
		}
		for i := 0; i < 8; i++ {
			for j := 0; j < 8; j++ {
				if board[i][j+1] == 1 && board[i][j+2] == 1 && board[i+1][j] == 1 && board[i+1][j+1] == 1 {
					ans = "G"
				}
			}
		}
		for i := 0; i < 8; i++ {
			for j := 0; j < 8; j++ {
				if board[i][j] == 1 && board[i+1][j] == 1 && board[i+1][j+1] == 1 && board[i+2][j+1] == 1 {
					ans = "F"
				}
			}
		}
		fmt.Println(ans)
	}
}

C++: #include<iostream>
#include<cstdio>

char data[8][8];
int px, py;

int main(){
	while (true){
		for(int i = 0; i < 8 ; i++){
			for(int j = 0; j < 8; j++){
				std::cin >> data[i][j];
				if(std::cin.eof())break;
				if(data[i][j] == '1')px = j, py = i;
			}
		}

		if (data[py][px - 1] == '1' && data[py - 1][px] == '1' && data[py - 1][px - 1] == '1')printf("A\n");
		else if (data[py - 1][px] == '1' && data[py - 2][px] == '1' && data[py - 3][px] == '1')printf("B\n");
		else if (data[py][px - 1] == '1' && data[py][px - 2] == '1' && data[py][px - 3] == '1')printf("C\n");
		else if (data[py][px - 1] == '1' && data[py + 1][px - 1] == '1' && data[py - 1][px] == '1')printf("D\n");
		else if (data[py][px - 1] == '1' && data[py - 1][px - 1] == '1' && data[py - 1][px - 2] == '1')printf("E\n");
		else if (data[py][px - 1] == '1' && data[py - 1][px - 1] == '1' && data[py + 1][px] == '1')printf("F\n");
		else if (data[py - 1][px] == '1' && data[py - 1][px + 1] == '1' && data[py][px - 1] == '1')printf("G\n");
	}     
	return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <vector>
using namespace std;
int main(void) {
    while(true) {
        vector<int> key;
        for(int r = 0; r < 8; r++) {
            int input; cin >> input;
            if(input != 0) key.push_back(input);
        }
        if(cin.eof()) break;
        int height = (int)key.size();
        switch(height) {
            case 1:cout << "C" << endl; break;
            case 2:
                if(key[0] == key[1]) cout << "A" << endl;
                else if(key[0] > key[1]) cout << "E" << endl;
                else                     cout << "G" << endl;
                break;
            case 3:
                if(key[0] < key[2]) cout << "D" << endl;
                else                cout << "F" << endl;
                break;
            default: cout << "B" << endl;
        }
    }
    return(0);
}

C++: #include<iostream>
#include<cstring>
using namespace std;
int x[13][13]; char a;
int main() {
	while (cin >> a) {
		memset(x, 0, sizeof(x));
		if (a == '0') { 
			x[1][1] = 0; 
		}
		if (a == '1') { 
			x[1][1] = 1; 
		}
		for (int i = 1; i <= 8; i++) {
			for (int j = 1; j <= 8; j++) {
				if (i + j > 2) {
					cin >> a; if (a == '0') { x[i][j] = 0; }
					else { x[i][j] = 1; }
				}
			}
		}
		for (int i = 1; i <= 8; i++) {
			for (int j = 1; j <= 8; j++) {
				if (x[i][j] == 1) {
					if (x[i + 1][j] == 1 && x[i][j + 1] == 1 && x[i + 1][j + 1] == 1) {
						cout << 'A' << endl; goto Exit;
					}
					if (x[i + 1][j] == 1 && x[i + 2][j] == 1 && x[i + 3][j] == 1) {
						cout << 'B' << endl; goto Exit;
					}
					if (x[i][j + 1] == 1 && x[i][j + 2] == 1 && x[i][j + 3] == 1) {
						cout << 'C' << endl; goto Exit;
					}
					if (x[i + 1][j - 1] == 1 && x[i + 1][j] == 1 && x[i + 2][j - 1] == 1) {
						cout << 'D' << endl; goto Exit;
					}
					if (x[i][j + 1] == 1 && x[i + 1][j + 1] == 1 && x[i + 1][j + 2] == 1) {
						cout << 'E' << endl; goto Exit;
					}
					if (x[i + 1][j] == 1 && x[i + 1][j + 1] == 1 && x[i + 2][j + 1] == 1) {
						cout << 'F' << endl; goto Exit;
					}
					if (x[i][j + 1] == 1 && x[i + 1][j - 1] == 1 && x[i + 1][j] == 1) {
						cout << 'G' << endl; goto Exit;
					}
				}
			}
		}
	Exit:;
	}
}

C++: #include<bits/stdc++.h>
#define rep(i,n)for(int i=0;i<n;i++)
using namespace std;

char s[18][18];
string buf;
int main(){
	do{
		memset(s,0,sizeof(s));
		for(int i=1;i<=8;i++)scanf("%s",s[i]+1);
		for(int i=1;i<=8;i++){
			for(int j=1;j<=8;j++){
				if(s[i][j]!='1')continue;
				if(s[i][j+1]=='1'&&s[i+1][j+1]=='1'&&s[i+1][j]=='1'){puts("A");goto p;}
				if(s[i+1][j]=='1'&&s[i+2][j]=='1'&&s[i+3][j]=='1'){puts("B");goto p;}
				if(s[i][j+1]=='1'&&s[i][j+2]=='1'&&s[i][j+3]=='1'){puts("C");goto p;}
				if(s[i+1][j-1]=='1'&&s[i+1][j]=='1'&&s[i+2][j-1]=='1'){puts("D");goto p;}
				if(s[i][j+1]=='1'&&s[i+1][j+1]=='1'&&s[i+1][j+2]=='1'){puts("E");goto p;}
				if(s[i+1][j]=='1'&&s[i+1][j+1]=='1'&&s[i+2][j+1]=='1'){puts("F");goto p;}
				if(s[i][j+1]=='1'&&s[i+1][j-1]=='1'&&s[i+1][j]=='1'){puts("G");goto p;}
			}
		}
		p:;
	}while(getline(cin,buf));
	return 0;
}