#!/usr/bin/env python3
import numpy as np

lines = np.array([np.array([ord(y) for y in x.strip()]) for x in open("input.txt")])
start = tuple(np.array(np.where(lines == ord('S'))).T[0])
end = tuple(np.array(np.where(lines == ord('E'))).T[0])

lines[start] = ord('a')
lines[end] = ord('z')
lines = lines-ord('a')


open = [(0, start, None)]
closed = dict()
while open:
    prio, n, prev = open.pop(0)
    if n in closed:
        continue
    closed[n] = (prio, prev)
    if n == end:
        path = [n]
        while path[-1] is not None:
            path.append(closed[path[-1]][1])
        print(len(path)-2)
        break

    for dx, dy in [(-1, 0), (0, -1), (1, 0), (0, 1)]:
        xn, yn = n[0]+dx, n[1]+dy
        if 0 <= xn < len(lines) and 0 <= yn < len(lines[0]) and lines[n] + 1 >= lines[xn, yn]:
            open.append((prio+1, (xn, yn), n))