f = open('24-011.txt')
s = f.read()
k1 = k2 = k3 = 0
ans = []
for x in range(len(s)-1):
    if s[x] == '@':
        k1 += 1
        ans.append(k1)
        if s[x+1] != "@":
            k1 = 0
    if s[x] == '#':
        k2 += 1
        ans.append(k2)
        if s[x+1] != "#":
            k2 = 0
    if s[x] == '&':
        k3 += 1
        ans.append(k3)
        if s[x+1] != "&":
            k3 = 0
print(max(ans))