# include 
     
      # include 
      
       # include 
       
        # include 
        
         using namespace std;char a[1010][1010];int dd[1010][1010];///宽度int r[1010],l[1010];int main(){    int t,i,j,n,m,max1;    while(~scanf("%d",&t))    {        while(t--)        {            scanf("%d%d",&n,&m);            getchar();            for(i=1; i<=n; i++)                for(j=1; j<=m; j++)                    cin>>a[i][j];            for(i=1; i<=m; i++)                dd[0][i]=0;///初始化虚设的一行            for(i=1; i<=n; i++) ///求出每点高度            {                for(j=1; j<=m; j++)                {                    if(a[i][j]=='F')                        dd[i][j]=dd[i-1][j]+1;                    else                        dd[i][j]=0;                }            }            max1=-1;            for(i=1; i<=n; i++)///转化为hdu1506            {                for(j=1; j<=m; j++)                    l[j]=r[j]=j;                for(j=2; j<=m; j++)                {                   while(dd[i][l[j]-1]>=dd[i][j]&&l[j]>1)                     l[j]=l[l[j]-1];                }                for(j=m-1; j>=1; j--)                {                   while(dd[i][r[j]+1]>=dd[i][j]&&r[j]