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
}

func main() {
	for {
		var board [][]int
		var ans string
		if board = scanBoard(); reflect.DeepEqual(board, [][]int{}) {
			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<cstdio>

using namespace std;
int map[8][8];
int block[7][4][4]={
	{
		{1,1,0,0},
		{1,1,0,0},
		{0,0,0,0},
		{0,0,0,0}
	},
	{
		{1,0,0,0},
		{1,0,0,0},
		{1,0,0,0},
		{1,0,0,0}
	},
	{
		{1,1,1,1},
		{0,0,0,0},
		{0,0,0,0},
		{0,0,0,0}
	},
	{
		{1,0,0,0},
		{1,0,0,0},
		{0,0,0,0},
		{0,0,0,0}
	},
	{
		{1,1,0,0},
		{0,1,1,0},
		{0,0,0,0},
		{0,0,0,0}
	},
	{
		{1,0,0,0},
		{1,1,0,0},
		{0,1,0,0},
		{0,0,0,0}
	},
	{
		{1,1,0,0},
		{1,0,0,0},
		{0,0,0,0},
		{0,0,0,0}
	}
};

int main()
{
	int x=-1,y=-1;
	while(true)
	{
		x=-1,y=-1;
	for(int i=0;i<8;i++)
	{
		char c[10];
		if(scanf("%s",c)==EOF)goto end;
		for(int j=0;j<8;j++)
		{
			map[i][j]=c[j]-'0';
			if(map[i][j]==1&&x==-1&&y==-1)
			{
				y=i,x=j;
			}
		}
	}
	for(int i=0;i<7;i++)
	{
		bool b=true;
		for(int j=0;j<4;j++)
		{
			for(int k=0;k<4;k++)
			{
				if(map[y+j][x+k]!=block[i][j][k])b=false;
			}
		}
		if(b)printf("%c\n",'A'+i);
	}
	}
	end:
	return 0;
}

C++: //0036
#include<iostream>
#include<algorithm>
using namespace std;
int main() {
	while (!cin.eof()) {
		char c[8][8];
		for (int i = 0; i < 8; i++)
			for (int j = 0; j < 8; j++)
				cin >> c[i][j];
		int a, b;
		for (int i = 0; i < 8; i++) {
			for (int j = 0; j < 8; j++) {
				if (c[i][j] == '1') {
					a = i;
					b = j;
					goto C;
				}
			}
		}
	C:
		if (c[a][b + 1] == '1') {
			if (c[a + 1][b] == '1') {
				if (c[a + 1][b + 1] == '1')
					cout << 'A';
				else cout << 'G';
			}
			else {
				if (c[a + 1][b + 1] == '1')
					cout << 'E';
				else cout << 'C';
			}
		}
		else if (c[a + 1][b + 1] == '1')
			cout << 'F';
		else if (c[a - 1][b + 1] == '1')
			cout << 'D';
		else cout << 'B';
		cout << endl;
	}
}

C++: #include <bits/stdc++.h>
using namespace std;

double eps = 1e-10;

int main() {
	string s[16];
	while(cin >> s[0]){
		for(int i = 1; i < 8; ++i){
			cin >> s[i];
		}
		int h, w;
		for(int i = 0; i < 8; ++i){
			for(int j = 0; j < 8; ++j){
				if(s[i][j] == '1'){
					h = i;
					w = j;
					goto next;
				}
			}
		}
		next:;
		if(s[h + 1][w] == '1' && s[h][w + 1] == '1' && s[h + 1][w + 1] == '1'){
			cout << "A" << endl;
		}
		else if(s[h + 1][w] == '1' && s[h + 2][w] == '1' && s[h + 3][w] == '1'){
			cout << "B" << endl;
		}
		else if(s[h][w + 1] == '1' && s[h][w + 2] == '1' && s[h][w + 3] == '1'){
			cout << "C" << endl;
		}
		else if(s[h + 1][w - 1] == '1' && s[h + 1][w] == '1' && s[h + 2][w - 1] == '1'){
			cout << "D" << endl;
		}
		else if(s[h][w + 1] == '1' && s[h + 1][w + 1] == '1' && s[h + 1][w + 2] == '1'){
			cout << "E" << endl;
		}
		else if(s[h + 1][w] == '1' && s[h + 1][w + 1] == '1' && s[h + 2][w + 1] == '1'){
			cout << "F" << endl;
		}
		else if(s[h][w + 1] == '1' && s[h + 1][w] == '1' && s[h + 1][w - 1] == '1'){
			cout << "G" << endl;
		}
	}
	return 0;
}

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

char m[8][8];
void figure(int, int);

int main() {

	while(1) {
		bool f = true;
		for(int i = 0; i < 8; i++) {
			for(int j = 0; j < 8; j++) {
				cin >> m[i][j];
				if(cin.eof()) {
					return 0;
				}
			}
		}
		for(int i = 0; i < 8; i++) {
			for(int j = 0; j < 8; j++) {
				if(m[i][j] == '1') {
					figure(i, j);
					f = false;
					break;
				}
			}
			if(!f) {
				break;
			}
		}
	}
}


void figure(int i, int j) {
	char s;
	if(m[i][j+1] == '1' && m[i+1][j+1]== '1' && m[i+1][j]== '1') {
		s = 'A';
	}
	else if(m[i+1][j] == '1' && m[i+2][j] == '1') {
		s = 'B';
	}
	else if(m[i][j+1] == '1' && m[i][j+2] == '1') {
		s = 'C';
	}
	else if(m[i][j+1] == '1' && m[i+1][j+1] == '1') {
		s = 'E';
	}
	else if(m[i][j+1] == '1') {
		s = 'G';
	}
	else if(m[i+1][j+1] == '1') {
		s = 'F';
	}
	else {
		s = 'D';
	}
	cout << s << endl;
}

C++: #include <stdio.h>
int main() {
    int RB[8][8],i,j;while (scanf("%1d",&RB[0][0])!=EOF) {for (i=1;i<8;scanf("%1d",&RB[0][i++]));for (i=1;i<8;i++) for (j=0;j<8;scanf("%1d",&RB[i][j++]));
        for (i=0;i<8;i++) for (j=0;j<8;j++) if (RB[i][j]) {if (j<=4 && RB[i][j+1]*RB[i][j+2]*RB[i][j+3]) puts("C"); else if (i<=4 && RB[i+1][j]*RB[i+2][j]*RB[i+3][j]) puts("B"); else if (i<7 && j<7) {
            if (RB[i+1][j]*RB[i][j+1]) puts("A"); else if (RB[i+2][j+1]) puts("F"); else puts("E");} else if (j<7 && RB[i][j+1]) puts("G"); else puts("D"); i=10,j=10;}}return 0;}