with open(r'24-0.txt', 'r') as file:
    c = 0
    for s in file:
        s = s.strip()
        flag1, flag2 = False, False
        for sym in s:
            if (not flag1) and (not flag2):
                if sym == 'A':
                    flag1 = True
            elif flag1:
                flag1 = False
                flag2 = True
            elif flag2:
                if sym == 'R':
                    c += 1
                    break
                else:
                    flag1, flag2 = False, False

    print(c)