C :

#include<stdio.h>
int main()
{
    int a,b,t;
    while(scanf("%d%d",&a,&b)!=EOF)
    {
        if(a>b) { t=a;a=b;b=t;}
       int i,x,count=0;
        for(i=a;i<=b;i++)
        {
            if(i>=100) x=i%100;
            else if(i<100) x=i;
            if(x==31)
            {
                printf("%d\n",i);
                count++;
            }

        }
        if(count==0) printf("NONE\n");
    }
    return 0;
}

C++ :

#include<stdio.h>
int main()
{
    //freopen("in.txt","r",stdin);
    //freopen("out.txt","w",stdout);
    int a,b;
    while(scanf("%d%d",&a,&b)!=EOF)
    {
            int tmp;
            if(a>b)
            {
                tmp=a;
                a=b;
                b=tmp;
            }
            int flag=0;
            for(int i=a; i<=b; i++)
            {
                if(flag==0)
                {
                    int j=i;
                    int c=j%10;
                    j/=10;
                    int d=j%10;
                    if(c==1&&d==3)
                    {
                        flag=1;
                        printf("%d\n",i);
                        i+=99;
                    }
                }
                else
                {
                    printf("%d\n",i);
                    i+=99;
                }
            }
            if(!flag)
                printf("NONE\n");
    }
    return 0;
}