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(), "")
		if reflect.DeepEqual(row, []string{}) {
			break
		}
		for j := 0; j < 8; j++ {
			ret[i][j], _ = strconv.Atoi(row[j])
		}
	}
	return ret
}

var emptyBoard = [][]int{{0,0,0,0,0,0,0,0},
						 {0,0,0,0,0,0,0,0},
						 {0,0,0,0,0,0,0,0},
	                     {0,0,0,0,0,0,0,0},
	                     {0,0,0,0,0,0,0,0},
	                     {0,0,0,0,0,0,0,0},
	                     {0,0,0,0,0,0,0,0},
	                     {0,0,0,0,0,0,0,0}}

func main() {
	for {
		var board [][]int
		var ans string
		if board = scanBoard(); reflect.DeepEqual(board, emptyBoard) {
			break
		}
		// fmt.Println(board)
		for i := 0; i < 7; i++ {
			for j := 0; j < 7; 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 < 5; 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 < 5; 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 < 6; i++ {
			for j := 0; j < 7; 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 < 7; i++ {
			for j := 0; j < 6; 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 < 7; i++ {
			for j := 0; j < 6; 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 < 6; i++ {
			for j := 0; j < 7; 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>
using namespace std;

char whatFigure(int x, int y, char field[][9]) {
    int sum = 0;
    sum += field[y][x + 1] - '0';
    sum += (field[y + 1][x + 1] - '0') << 1;
    sum += (field[y + 1][x] - '0') << 2;
    if (x > 0) {
        sum += (field[y + 1][x - 1] - '0') << 3;
    }
    switch (sum) {
    case 7:
        return 'A';
        break;
    case 4:
        return 'B';
        break;
    case 1:
        return 'C';
        break;
    case 12:
        return 'D';
        break;
    case 3:
        return 'E';
        break;
    case 6:
        return 'F';
        break;
    case 13:
        return 'G';
        break;
    default:
        return '0';
        break;
    }
}

int main() {
    char field[8][9] = {};
start:
    while (cin >> field[0]) {
        for (int i = 1; i < 8; i++) {
            cin >> field[i];
        }
        for (int y = 0; y < 8; y++) {
            for (int x = 0; x < 8; x++) {
                if (field[y][x] == '1') {
                    cout << whatFigure(x, y, field) << endl;
                    goto start;
                }
            }
        }
    }
}

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

int main(){
	char p[7][18] = {"1100000011", "10000000100000001", "1111", "1000000110000001", "11000000011", "10000000110000000", "110000011"};
	char f[65];
	char t;
	while(1 + scanf("%c", &f[0])){
		for(int i = 1; i < 64; i++){
			scanf("%c", &t);
			if(t - 10){
				f[i] = t;
			}else{
				i--;
			}
		}
		f[64] = '\0';
		for(int i = 0; i < 7; i++){
			if(strstr(f, p[i])){
				printf("%c\n", i + 'A');
			}
		}
	}
	return 0;
}

C++: #include <iostream>
#include <vector>
#include <algorithm>
#include <cstdio>
#include <string>

#define rep(x,to) for(int x=0;x<to;x++)
#define rep2(x,from,to) for(int x=from;x<to;x++)

using namespace std;


int main(void){

int cnt=0;
string  w[12];
string ans;

	while(!cin.eof()){
		ans = "?";
		rep(i,8) rep(j,8) cin >> w[i][j];
		if(cin.eof()) break;
		rep(i,8) rep(j,8) if(w[i][j] == '1'){
			if(w[i][j+1]=='1' &&  w[i][j+2]=='1' && w[i][j+3]=='1'){
				ans = "C";  break; }
			if(w[i][j+1] =='1' && w[i+1][j+1]=='1' &&  w[i+1][j]=='1' ){
				ans = "A";  break; }
			if(w[i+1][j-1]=='1' && w[i+1][j]=='1' && w[i+2][j-1]=='1'){
				ans = "D";  break; }
			if(w[i][j+1]=='1' && w[i+1][j+1]=='1' && w[i+1][j+2]=='1'){
				ans = "E";  break; }
			if(w[i+1][j]=='1' && w[i+1][j+1]=='1' && w[i+2][j+1]=='1'){
				ans = "F";  break; }
			if(w[i][j+1]=='1' && w[i+1][j-1]=='1' && w[i+1][j]=='1' ){
				ans = "G";  break; }
			if(w[i+1][j]=='1' && w[i+2][j]=='1' && w[i+3][j]=='1' ){
				ans = "B";  break; }
			}
		cout <<  ans << endl;
//		cnt++; if(cnt>40) break;
	}
	return 0;
	
	
}

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

int main(){
	char p[7][19] = {"1100000011", "10000000100000001", "1111", "1000000110000001", "11000000011", "100000001100000001", "110000011"};
	char f[65];
	char t;
	while(1 + scanf("%c", &t)){
		if(t-10){
			f[0] = t;
		}else{
			scanf("%c", &f[0]);
		}
		for(int i = 1; i < 64; i++){
			scanf("%c", &t);
			if(t - 10){
				f[i] = t;
			}else{
				i--;
			}
		}
		f[64] = '\0';
		for(int i = 0; i < 7; i++){
			if(strstr(f, p[i])){
				printf("%c\n", i + 'A');
			}
		}
	}
	return 0;
}

C++: #include <iostream>
#include <stdio.h>
using namespace std;

int main(){
	int mass[8][8];
	
	BEGIN:
	while(scanf("%d%d%d%d%d%d%d%d",(*mass[0]),(*mass[0])+1,(*mass[0])+2,(*mass[0])+3,(*mass[0])+4,
		(*mass[0])+5,(*mass[0])+6,(*mass[0])+7)!=EOF)
	{
		for(int i=1;i<8;i++){
			scanf("%d%d%d%d%d%d%d%d",(*mass[i]),(*mass[i]+1),(*mass[i]+2),(*mass[i]+3),(*mass[i]+4),
				(*mass[i]+5),(*mass[i]+6),(*mass[i]+7));
		}
		for(int i=0;i<8;i++){
			for(int j=0;j<8;j++){
				if(mass[i][j]){
					if(j==7){
						if(mass[i+1][j]){
							cout<<(mass[i+1][j-1]?"D\n":"B\n");
						}
					}else if(j==0){
						if(mass[i][j+1]){
							if(mass[i+1][j]) cout<<"A\n";
							else if(mass[i][j+2]) cout<<"C\n";
							else cout<<"E\n";
						}
						else cout<<(mass[i+1][j+1]?"F\n":"B\n");
					}else{
						if(mass[i][j+2]) cout<<"C\n";
						else if(mass[i][j+1]){
							if(mass[i+1][j]){
								cout<<(mass[i+1][j+1]?"A\n":"G\n");
							}
							else cout<<"E\n";
						}
						else if(mass[i+2][j]) cout<<"B\n";
						else cout<<(mass[i+1][j+1]?"F\n":"D\n");
					}
					goto BEGIN;
				}
			}
			return 0;
		}
	}
}

C++: #include <stdio.h>
int main(){
	char c[100][100];
	bool f;
	while(scanf("%s",c[0])!=EOF){
		f=true;
		for(int i=1;i<8;i++)scanf("%s",c[i]);
		for(int i=0;i<8&&f;i++)for(int j=0;j<8&&f;j++){
			if(c[i][j]=='1'){
				f=false;
				if(c[i][j+1]=='1'){
					if(c[i][j+2]=='1')printf("C\n");
					else if(c[i+1][j]=='1'){
						if(c[i+1][j+1]=='1')printf("A\n");
						else printf("G\n");
					}
					else printf("E\n");
				}
				else if(c[i+2][j]=='1')printf("B\n");
				else if(c[i+2][j+1]=='1')printf("F\n");
				else printf("D\n");
			}
		}
	}
}