i don't understand why this solution of mine is giving WA. works perfectly on ideone.

include<stdio.h>

main() { int t,test,m,n,p,q,i,j,k,l,flag=1,x,y,c=0; char a[1005][1005]; int ma[1005],na[1005]; scanf("%d",&t);

for(test=0;test<t;test++)
{
    scanf("%d",&m);
    scanf("%d",&n);

    scanf("%d",&p);
    scanf("%d",&q);

    for(i=0;i<m;i++)
    {
        getchar();
        for(j=0;j<n;j++)
        {
            scanf("%c",&a[i][j]);
        }
    }

    for(i=0;i<=m-p;i++)
    {
        for(j=0;j<=n-q;j++)
        {
            flag=1;
            if(a[i][j]=='#')
            {
                for(k=i;k<(p+i);k++)
                {
                    for(l=j;l<(q+j);l++)
                    {
                        if(a[k][l]!='#')
                        flag=0;
                    }
                }
                if(flag==1)
                {

                ma[x++]=i;
                na[y++]=j;
                c++;
                }   
             }
        }
    }
    if(c!=0)
    {
    printf("%d\n",c);
    for(i=0;i<x;i++)
    printf("%d %d\n",ma[i],na[i]);
    c=0;
    }
    else
    printf("0\n");
    x=y=0;
    flag=1;

} }