#include <cstdio>
#include <cctype>

void newline(int spaces)
{
    if(spaces > 0) putchar('\n');
    for(int i = 0; i < spaces; ++i) putchar(' ');
}
void inout(int level)
{
    newline(level << 2);
    
    int c;
    bool afterPeriod = false;
    while((c = getchar()) != -1){
        if(isspace(c)) continue;
        if(c == '{'){
            if(level) putchar(' ');
            putchar('{');
            inout(level+1);     //start a new level
        }
        else if(c == ';'){
            putchar(';');
            afterPeriod = true;
        }
        else if(c == '}'){
            if(level > 1) newline((level-1) << 2);
            else putchar('\n');
            putchar('}');       //last level's end
            return;             
        }
        else if(c == ','){
            putchar(',');
            putchar(' ');
        }
        else{
            if(afterPeriod){
                newline(level << 2);
                afterPeriod = false;
            }
            putchar(c);
        }
    }
}

int main()
{
    freopen("in.txt", "r", stdin);
    freopen("out.txt", "w", stdout);
    
    inout(0);
    
    return 0;
}