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n = int(input())
s = []
x = []
buf = ""
for i in range(n):
    buf = input()
    s.append(buf.split()[0])
    x.append(int(buf.split()[1]))

output = []
for i in range(n):
    if s[i] == "NIE":
        continue
    if len(output) >= 10 and x[i] >= 2:
        continue
    output.append(i+1)

for i in range(20):
    print(output[i], end = "")
    if i < 19:
        print(" ", end = "")