import sys
input = sys.stdin.readline
from collections import deque

H,W,sx,sy=list(map(int,input().split()))

S=[input().strip() for i in range(H)]

DP0=[[1<<60]*W for i in range(H)]
DP1=[[1<<60]*W for i in range(H)]
sx-=1
sy-=1

DP0[sx][sy]=0
Q=deque()
Q.append((sx,sy,0))

while Q:
    #print(Q)
    x,y,kai=Q.popleft()

    if kai%2==0:
        for z in range(1,10**6):
            if 0<=x+z<H and 0<=y<W and S[x+z][y]!="#":
                if DP1[x+z][y]>kai+1:
                    DP1[x+z][y]=kai+1
                    Q.append((x+z,y,kai+1))
                elif DP1[x+z][y]==kai+1:
                    pass
                else:
                    break
            else:
                break

        for z in range(1,10**6):
            if 0<=x-z<H and 0<=y<W and S[x-z][y]!="#":
                if DP1[x-z][y]>kai+1:
                    DP1[x-z][y]=kai+1
                    Q.append((x-z,y,kai+1))
                elif DP1[x-z][y]==kai+1:
                    pass
                else:
                    break
            else:
                break
        for z in range(1,10**6):
            if 0<=x<H and 0<=y+z<W and S[x][y+z]!="#":
                if DP1[x][y+z]>kai+1:
                    DP1[x][y+z]=kai+1
                    Q.append((x,y+z,kai+1))
                elif DP1[x][y+z]==kai+1:
                    pass
                else:
                    break
            else:
                break

        for z in range(1,10**6):
            if 0<=x<H and 0<=y-z<W and S[x][y-z]!="#":
                if DP1[x][y-z]>kai+1:
                    DP1[x][y-z]=kai+1
                    Q.append((x,y-z,kai+1))
                elif DP1[x][y-z]==kai+1:
                    pass
                else:
                    break
            else:
                break
        for z in range(1,10**6):
            if 0<=x+z<H and 0<=y+z<W and S[x+z][y+z]!="#":
                if DP1[x+z][y+z]>kai+1:
                    DP1[x+z][y+z]=kai+1
                    Q.append((x+z,y+z,kai+1))
                elif DP1[x+z][y+z]==kai+1:
                    pass
                else:
                    break
            else:
                break

        for z in range(1,10**6):
            if 0<=x-z<H and 0<=y+z<W and S[x-z][y+z]!="#":
                if DP1[x-z][y+z]>kai+1:
                    DP1[x-z][y+z]=kai+1
                    Q.append((x-z,y+z,kai+1))
                elif DP1[x-z][y+z]==kai+1:
                    pass
                else:
                    break
            else:
                break
        for z in range(1,10**6):
            if 0<=x+z<H and 0<=y-z<W and S[x+z][y-z]!="#":
                if DP1[x+z][y-z]>kai+1:
                    DP1[x+z][y-z]=kai+1
                    Q.append((x+z,y-z,kai+1))
                elif DP1[x+z][y-z]==kai+1:
                    pass
                else:
                    break
            else:
                break

        for z in range(1,10**6):
            if 0<=x-z<H and 0<=y-z<W and S[x-z][y-z]!="#":
                if DP1[x-z][y-z]>kai+1:
                    DP1[x-z][y-z]=kai+1
                    Q.append((x-z,y-z,kai+1))
                elif DP1[x-z][y-z]==kai+1:
                    pass
                else:
                    break
            else:
                break
    else:
        for z in range(1,10**6):
            if 0<=x+z<H and 0<=y<W and S[x+z][y]!="#":
                if DP0[x+z][y]>kai+1:
                    DP0[x+z][y]=kai+1
                    Q.append((x+z,y,kai+1))
                elif DP0[x+z][y]==kai+1:
                    pass
                else:
                    break
            else:
                break

        for z in range(1,10**6):
            if 0<=x-z<H and 0<=y<W and S[x-z][y]!="#":
                if DP0[x-z][y]>kai+1:
                    DP0[x-z][y]=kai+1
                    Q.append((x-z,y,kai+1))
                elif DP0[x-z][y]==kai+1:
                    pass
                else:
                    break
            else:
                break
        for z in range(1,10**6):
            if 0<=x<H and 0<=y+z<W and S[x][y+z]!="#":
                if DP0[x][y+z]>kai+1:
                    DP0[x][y+z]=kai+1
                    Q.append((x,y+z,kai+1))
                elif DP0[x][y+z]==kai+1:
                    pass
                else:
                    break
            else:
                break

        for z in range(1,10**6):
            if 0<=x<H and 0<=y-z<W and S[x][y-z]!="#":
                if DP0[x][y-z]>kai+1:
                    DP0[x][y-z]=kai+1
                    Q.append((x,y-z,kai+1))
                elif DP0[x][y-z]==kai+1:
                    pass
                else:
                    break
            else:
                break
        for z in range(1,10**6):
            if 0<=x+z<H and 0<=y+z<W and S[x+z][y+z]!="#":
                if DP0[x+z][y+z]>kai+1:
                    DP0[x+z][y+z]=kai+1
                    Q.append((x+z,y+z,kai+1))
                elif DP0[x+z][y+z]==kai+1:
                    pass
                else:
                    break
            else:
                break

        for z in range(1,10**6):
            if 0<=x-z<H and 0<=y+z<W and S[x-z][y+z]!="#":
                if DP0[x-z][y+z]>kai+1:
                    DP0[x-z][y+z]=kai+1
                    Q.append((x-z,y+z,kai+1))
                elif DP0[x-z][y+z]==kai+1:
                    pass
                else:
                    break
            else:
                break
        for z in range(1,10**6):
            if 0<=x+z<H and 0<=y-z<W and S[x+z][y-z]!="#":
                if DP0[x+z][y-z]>kai+1:
                    DP0[x+z][y-z]=kai+1
                    Q.append((x+z,y-z,kai+1))
                elif DP0[x+z][y-z]==kai+1:
                    pass
                else:
                    break
            else:
                break

        for z in range(1,10**6):
            if 0<=x-z<H and 0<=y-z<W and S[x-z][y-z]!="#":
                if DP0[x-z][y-z]>kai+1:
                    DP0[x-z][y-z]=kai+1
                    Q.append((x-z,y-z,kai+1))
                elif DP0[x-z][y-z]==kai+1:
                    pass
                else:
                    break
            else:
                break
c=0
for i in range(H):
    for j in range(W):
        if DP0[i][j]!=1<<60:
            c=max(c,DP0[i][j])
        if DP1[i][j]!=1<<60:
            c=max(c,DP1[i][j])

Q=int(input())

for tests in range(Q):
    gx,gy,T=list(map(int,input().split()))
    gx-=1
    gy-=1

    if c==0:
        print("No")
        continue

    if T%2==0:
        if DP0[gx][gy]==1<<60:
            print("No")
        else:
            if DP0[gx][gy]<=T:
                print("Yes")
            else:
                print("No")

    else:
        if DP1[gx][gy]==1<<60:
            print("No")
        else:
            if DP1[gx][gy]<=T:
                print("Yes")
            else:
                print("No")