#!/usr/bin/python
inp=file("DATA4.txt")
out=file("OUT4.txt","w")
for _ in xrange(5):
	a=[list(inp.readline().rstrip(" \r\n"))for _ in xrange(10)]
	last=-1
	for t in xrange(100):
		b=map(lambda x:x[:],a)
		cur=0
		for x in xrange(10):
			for y in xrange(10):
				if a[x][y]=="T":
					cur+=1
					for [dx,dy]in((x+1,y),(x-1,y),(x,y+1),(x,y-1)):
						if dx>=0 and dx<10 and dy>=0 and dy<10 and a[dx][dy]=="F":
								b[x][y]="F"
		if cur==0:
			out.write(str(t)+"\n")
			break
		elif cur==last:
			out.write("-1\n")
			break
		last=cur
		a=b
	inp.readline()