C++ :

#include<bits/stdc++.h>
using namespace std;
int main(){
	long long n;
	cin>>n;
	while(n!=0){
		cout<<n%10<<" ";
		n=n/10;
	}
	return 0;
}

Python :

# coding=utf-8
n=input()
s=len(n)
m=int(n)
while(s>0):
    print(m%10,end=' ')
    m//=10
    s-=1