1014 B | 1006 chars
"""
[31844: 창고지기](https://www.acmicpc.net/problem/31844)
Tier: Bronze 2
Category: implementation, string
"""
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
SYS_INPUT = True
RECURSION_LIMIT = 10 ** 7
SET_RECURSION = False
BLANK = " "
if SET_RECURSION:
sys.setrecursionlimit(RECURSION_LIMIT)
inp = lambda : sys.stdin.readline().rstrip() if SYS_INPUT else input()
mii = lambda : [*map(int,inp().split())]
mfi = lambda : [*map(float,inp().split())]
ii = lambda : int(inp())
fi = lambda : float(inp())
isplit = lambda : inp().split()
p = print
def gcd(a, b): return gcd(b, a % b) if b > 0 else a
def lcm(a, b): return a * b // gcd(a, b)
def solve():
s = inp()
robot = s.index('@')
box = s.index('#')
target = s.index('!')
if robot < box < target:
p(target - robot - 1)
elif target < box < robot:
p(robot - target - 1)
else:
p(-1)
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()