f=200001;v=[0]*f;g=[[]for _ in[0]*f];s=[1];n,m,k=map(int,input().split())
for _ in range(m):a,b=map(int,input().split());g[b]+=a,;g[a]+=b,
while 1:
    v[s[-1]]=1
    for i in g[s[-1]]:
        if v[i]<1:s+=i,;break
    else:
        t=set(g[s[-1]])
        for i in range(len(s)):
            if s[i]in t:exit(print(len(s)-i,*s[i:]))