#include<stdio.h>
void shuru( int [] ,int [] ,int , int * );
void shuchu( int []  ,int , int  );
int main(void)
{
	int n , bj  = 0 ;
	scanf("%d" , &n );
	int s1[8] ,s2[8] ; 
	shuru( s1 , s2 , n  , &bj);
	shuchu( s1 , n , bj );
	return 0 ; 
}
void shuchu( int s1[]  ,int n, int  t)
{
	if( t != 0 )  
	{  
        int tag = 0;  
        int flg = 0;
		int i , j ;   
        for( i = 0 ; i < n ;i ++ )  
        {  
            int sum = 0 ;  
            if( s1[i] != 0 )  
            {  
                for( j = 0 ;j < n ; j ++ )  
                {  
                    if( i == j )
					{
						continue;
					}  
                    if(s1[i] == s1[j]) 
					{
					    sum ++ ;	
					} 
                    if(s1[j] == s1[i] + 1 ) 
					{
						sum = 0 ;	
					} 
                          
                }  
                if(sum >= s1[i] && flg <= s1[i])  
                {  
                    printf("%d", i + 1 );  
                    flg ++ ;  
                }  
            }  
            else  
            {  
                for( j = 0 ; j < n ; j ++ ) 
				{
					if(s1[j] == 1 )
					{
						tag ++ ;	
					}  
				} 
                if(tag == 0 )  
                {  
                    printf("%d", i+1);  
                    tag = -1 ;  
                }  
            }  
        }  
        if(flg == 0 && tag != -1 )
		{
			printf("NoSolution"); 
		}  
    }  
    else  
    {
    	putchar('0'); 	
	}
         
}
void shuru( int s1[] ,int s2[] ,int n , int * bj )
{
	int  i ; 
	for( i = 0 ; i < n ; i ++ )
	{
		scanf("%d%d" , &s1[i] , &s2[i]);
		if( s1[i] == 0 )
		{
			++ * bj ; 
		}
	}
}
/**************************************************************
	Problem: 1865
	User: admin
	Language: C++
	Result: Accepted
	Time:53 ms
	Memory:1144 kb
****************************************************************/