def solve():
out = ""
current_tag = ""
tabs = 0
for i in input():
current_tag += i
if i == ">":
if current_tag[1] == "/":
if tabs-1 < 0:
out += current_tag
out += '\n'
current_tag = ""
else:
tabs -= 1
out += tabs*' '
out += current_tag
out += '\n'
current_tag = ""
else:
out += tabs*' '
out += current_tag
out += '\n'
tabs += 1
current_tag = ""
print(out)
solve()
#include<bits/stdc++.h>
using namespace std;
#define rew(x) for(int i = 0 ; i < x ; i++)
int main(){
string s;
cin >> s;
int n = s.length();
string space = " ";
int spc = 0;
int looping = (n/7)*6;
int temp = looping;
int i = 0;
while(looping){
char a = s[i];
if(a == '/'){
looping += 1;
spc -=1;
}
if(((a - 'a') <26) && ((a - 'a') >= 0)){
if(s[i + 4] == a){
spc -= 1;
}
}
if(((a - 'a') <26) && ((a - 'a') >= 0)){
if((s[i + 4] != a ) && (s[i+3] == '/')){
spc -= 1;
}
}
cout << a;
if(a == '>'){
cout << "\n";
spc+=1;
rew(spc){
cout << space;
}
}
looping--;
i++;
}
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