def walk_around_cycles(perm):
    t=[]
    m=0
    while(True):
        i=m
        c=[i+1]
        while perm[i]:
            j,i=i,perm[i]-1
            perm[j]=0
            c.append(i+1)
        t.append(c)
        while(m<len(perm) and not perm[m]):m=m+1
        if m>=len(perm):
            break
    return t
inputfile=open("in20_5.txt",'r')
k=inputfile.readline()
inp1=inputfile.readline().split(' ')
inputfile.close()
perm=[]
for i in range(len(inp1)):
    perm.append(int(inp1[i]))
cycles=walk_around_cycles(perm)
ourtstr=""
ourtstr=ourtstr+str(len(cycles))+"\n"

for k in range(len(cycles)):
    ourtstr=ourtstr+str(cycles[k])+"\n"
outputfile=open("out_25_20_5.txt",'w')
print ourtstr
outputfile.write(ourtstr)
outputfile.close()