import pypyjit
pypyjit.set_param("max_unroll_recursion=-1")
import sys
sys.setrecursionlimit(10**7)
from collections import defaultdict
H,W,N = list(map(int,input().split()))

city = []
x_is = defaultdict(list)
y_is = defaultdict(list)
sy,sx = -1,-1
for i in range(N):
    y,x = list(map(int,input().split()))
    y -= 1;x -= 1
    city.append((y,x))
    y_is[y].append((x,i))
    x_is[x].append((y,i))
    if(sy == sx == -1):
        sy = y
        sx = x

visited = set()
ans = []
def dfs(n,odd):
    if(n == 0 and visited):
        print(*ans)
        exit()

    if(visited or n != 0):visited.add((n,odd))
    ans.append(n+1)

    y,x = city[n]
    if(odd):
        for y,idx in x_is[x]:
            if((idx,not odd) in visited):continue
            if(n == idx):continue
            dfs(idx,not odd)
    else:
        for x,idx in y_is[y]:
            if((idx, not odd) in visited):continue
            if(n == idx):continue
            dfs(idx,not odd)
    ans.pop()

dfs(0,True)
print(-1)