3
2 1 1
 6
6 2 6 2 4 2
 2
1 2
 8
2 1 2 2 6 5 6 6
 18
2 3 4 5 2 7 8 9 10 7 11 12 14 15 13 17 18 18
 7
1 2 3 4 5 6 7
 7
4 3 2 6 3 5 2
 7
7 5 3 1 2 1 5
 7
1 6 4 4 5 6 7

1
2 2 1  0
6 2 6 2 4 2  1 
1 1 
 2 
2 2 2 2 6 2 6 6 
 5 
2 3 4 5 11 7 8 9 10 11 11 11 14 15 11 17 18 11 
 6 
1 1 1 1 1 1 1 
 1
4 3 3 6 3 5 2  1
7 5 3 1 3 1 5  4 
1 6 4 1 1 1 1 

# [https://codeforces.com/contest/698/submission/42129034]

input()

A = list(map(int, input().split(' ')))

root = -1

for i,a in enumerate(A) :
    if i == a-1 :
        root = i
        break
    
v = [False]*len(A)
if root>-1 :
    v[root]=True
    
changed = 0

for i,a in enumerate(A) :
    if v[i] :
        continue
    v[i]= True
    l=[i]
    a-=1
    while not v[a] :
        l.append(a)
        v[a]=True
        a=A[a]-1
    if a in l: 
        if root==-1:
            A[a]=a+1
            root=a
            changed+=1
        else :
            A[a]=root+1
            changed+=1
        
print(changed)
print(' '.join(map(str,A)))