Lehmät

contents = []
cows = 0
while True:
    try:
        line = input()
    except EOFError:
        break
    contents.append(line)
 
for line in contents:
  a = line.split("*")
  if len(a) == 3:
    b = a[1].count("@")
    cows = cows + b
 
print(cows)

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 1, 2

Verdict: ACCEPTED

Test 4

Group: 1, 2

Verdict: ACCEPTED

Test 5

Group: 1, 2

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED