n = int(raw_input())
din = list()
c = dict()
ans = dict()
for i in range(n):
    k,v = raw_input().split(' ')
    din.append((k,v))
for k,v in din:
    if k in c.keys():
        if k in ans.keys():
            ans[k] = ans[k]+[v]
        else:
            ans[k] = [c[k]]+[v]
    else:
        c[k] = v
if len(ans)==0:
    print("YES")
else:
    for k in list(sorted(ans.keys())):
        print(str(k)+' '+' '.join(ans[k]))