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)
		fmt.Scanln()
	}
}

Python: A=[[0,0],[1,0],[0,1],[1,1]]
B=[[0,0],[0,1],[0,2],[0,3]]
C=[[0,0],[1,0],[2,0],[3,0]]
D=[[0,0],[-1,1],[0,1],[-1,2]]
E=[[0,0],[1,0],[1,1],[2,1]]
F=[[0,0],[0,1],[1,1],[1,2]]
G=[[0,0],[1,0],[-1,1],[0,1]]
humen=[]
gentenx="0"
genteny="0"
kigou=[]
ans=[]
s=""
while(1):
    
    
    if len(humen)>=8:
        for y in range(0,8):#y
            for x in range(0,8):#x
                if humen[y][x]=="1" and gentenx=="0" and genteny=="0":#位置記憶
                    gentenx=x
                    genteny=y
                    kigou.append([0,0])
                elif humen[y][x]=="1" :
                    kigou.append([x-gentenx,y-genteny])
        if A==kigou:ans.append("A")
        if B==kigou:ans.append("B")
        if C==kigou:ans.append("C")
        if D==kigou:ans.append("D")
        if E==kigou:ans.append("E")
        if F==kigou:ans.append("F")
        if G==kigou:ans.append("G")
        kigou=[]
        humen=[]
        gentenx="0"
        genteny="0"
    try: s=str(input(""))
    except:break
    if s!="":humen.append(list(s))

for i in ans:
    print(i)

Python: while 1:
 a=[list(map(int,input()))for _ in[0]*8]
 y=[sum(r)for r in a]
 x=[sum(c)for c in zip(*a)]
 if 4 in x:s='B'
 elif 4 in y:s='C'
 elif 1 in y:s='DF'[a[y.index(1)][x.index(2)]]
 elif 1 in x:s='GE'[a[y.index(2)][x.index(1)]]
 else:s='A'
 print(s)
 try:input()
 except:break

Python: while 1:
 a=[list(map(int,input()))for _ in[0]*8]
 y=[sum(r)for r in a]
 x=[sum(c)for c in zip(*a)]
 print('B'if 4 in x else'C'if 4 in y else'DF'[a[y.index(1)][x.index(2)]]if 1 in y else'GE'[a[y.index(2)][x.index(1)]]if 1 in x else'A')
 try:input()
 except:break

Python: # AOJ 0036: A Figure on Surface
# Python3 2018.6.27 bal4u

def judge(sr, sc, tbl):
	if 4 in sr: return 'C'
	if 4 in sc: return 'B'
	if 1 in sr: return 'F' if tbl[sr.index(1)][sc.index(2)] == 1 else 'D'
	if 1 in sc: return 'E' if tbl[sr.index(2)][sc.index(1)] == 1 else 'G'
	return 'A'

tbl = [[] for i in range(8)]
while True:
	for r in range(8): tbl[r] = list(map(int, input()))
	sr, sc = [0]*8, [0]*8
	for i in range(8): sr[i] = sum(tbl[i])
	for i in range(8): sc[i] = sum([tbl[r][i] for r in range(8)])
	print(judge(sr, sc, tbl))
	try: input()
	except: break

Python: #"1"の座標を、最初のものを(0,0)として切り出し
def trim(mp):
  ret = []

  for x in range(8):
    for y in range(8):
      if mp[y][x] == "1":
        if not ret:
          refer = (x, y)
        ret.append((x, y))

  ret = [(x - refer[0], y - refer[1]) for x, y in ret]
  return ret

#座標が一致したものを出力
def put_ans(points):
  if points == [(0, 0), (0, 1), (1, 0), (1, 1)]: print("A")
  if points == [(0, 0), (0, 1), (0, 2), (0, 3)]: print("B")
  if points == [(0, 0), (1, 0), (2, 0), (3, 0)]: print("C")
  if points == [(0, 0), (0, 1), (1, -1), (1, 0)]: print("D")
  if points == [(0, 0), (1, 0), (1, 1), (2, 1)]: print("E")
  if points == [(0, 0), (0, 1), (1, 1), (1, 2)]: print("F")
  if points == [(0, 0), (1, -1), (1, 0), (2, -1)]: print("G")

while True:
  mp = [input() for _ in range(8)]
  put_ans(trim(mp))
  try:
    input()
  except EOFError:
    break

Python: while 1:
 a=[list(map(int,input()))for _ in[0]*8]
 y=[sum(r)for r in a]
 x=[sum(c)for c in zip(*a)]
 if 4 in x:print('B')
 elif 4 in y:print('C')
 elif 1 in y:print('DF'[a[y.index(1)][x.index(2)]])
 elif 1 in x:print('GE'[a[y.index(2)][x.index(1)]])
 else:print('A')
 try:input()
 except:break

Python: while True:
    try:
        cnt = 0
        for i in range(8):
            inp = input()
            if cnt == 1:
                if inp.count("1") == 1:
                    print("B")
                elif inp.index("1") == ind:
                    print("F")
                else:
                    print("D")
                cnt = -1
            elif cnt == 2:
                if inp.index("1") == ind:
                    print("A")
                elif inp.index("1") == ind + 1:
                    print("E")
                else:
                    print("G")
                cnt = -1
            elif cnt == 4:
                print("C")
                cnt = -1
            elif "1" in inp and cnt == 0:
                ind = inp.index("1")
                cnt = inp.count("1")
        inp = input()
    except:
        break

Python: while True:
    try:
        string = [input() for _ in range(8)]
        string = [int(l) for line in string for l in line] + [0]*16
        one = string.index(1)
        s = string[one:]
        ones = [[1, 8, 9], [8, 16, 24], [1, 2, 3],
                [7, 8, 15], [1, 9, 10], [8, 9, 17], [1, 7, 8]]
        ans = {0: "A", 1: "B", 2: "C", 3: "D", 4: "E", 5: "F", 6: "G"}
        for k, o in enumerate(ones):
            if all([s[o[0]], s[o[1]], s[o[2]]]):
                print(ans[k])
        input()
    except:
        break

Python: while True:
    try:
        cnt = 0
        for i in range(8):
            inp = input()
            if cnt == 1:
                if inp.count("1") == 1:
                    print("B")
                elif inp.index("1") == ind:
                    print("F")
                else:
                    print("D")
                cnt = -1
            elif cnt == 2:
                if inp.index("1") == ind:
                    print("A")
                elif inp.index("1") == ind + 1:
                    print("E")
                else:
                    print("G")
                cnt = -1
            elif cnt == 4:
                print("C")
                cnt = -1
            elif "1" in inp:
                ind = inp.index("1")
                cnt = inp.count("1")
        inp = input()
    except:
        break