def main():
    n = int(input())
    projects = dict()
    for i in range(n):
        name, version = input().split()
        if i == 0:
            pn = name
            pv = int(version)
        if name not in projects:
            projects[name] = dict()
        projects[name][int(version)] = list()
        k = int(input())
        for j in range(k):
            na, v = input().split()
            projects[name][int(version)].append((na, int(v)))
        if i != (n - 1):
            input()
    line = list()
    line.append((pn, pv))
    ind = 0
    d = dict()
    depth = dict()
    dd = 0
    while len(line) != 0:
        line2 = list()
        while ind != len(line):
            name, version = line[ind]
            ind += 1
            for (nm, vr) in projects[name][version]:
                if nm not in d:
                    d[nm] = vr
                    line2.append(nm)
                    depth[nm] = dd
                else:
                    if depth[nm] == dd:
                        d[nm] = max(d[nm], vr)
        line = list()
        ind = 0
        for elem in line2:
            line.append((elem, d[elem]))
        dd += 1
    line = list()
    for key in d:
        if key != pn:
            line.append([key, d[key]])
    line.sort()
    print(len(line))
    for name, version in line:
        print(name, version)

main()