import sys
inp = lambda : sys.stdin.readline()
p = print
def solve():
d = {}
while 1:
try:
s = inp()
except:
break
if len(s) == 0:
break
crt = s[11:]
d[crt] = d.get(crt, 0) + 1
p(len(d.values()))
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()