from sys import stdin, stdout

def main():
    n = int(stdin.readline())
    torv = [None] * n
    vInd = [None] * n
    for i in range(n):
        be = stdin.readline()
        if "R" in be:
            torv[i] = "R"
        else:
            be = be.split()
            torv[i] = "V"
            vInd[i] = int(be[1])
    akt = [None] * n
    for i in range(n):
        if torv[i] == "R":
            akt[i] = 1
        else:
            akt[i] = 1
            akt[vInd[i]-1] = 0
            if torv[vInd[i]-1] == "V":
                akt[vInd[vInd[i]-1]-1] = 1
    stdout.writelines(str(akt.count(1)) + "\n")
    for i in range(n):
        if akt[i] == 1:
            stdout.write(str(i+1) + " ")

main()