#include<stdio.h>
#include<string.h>
int main()
{
    char message[1001];
    int s,l;
    scanf("%d",message);
    scanf("%d",&s);
    scanf("%d",&l);
    int len = strlen (message);
    if(s<0 || s>len || l<1  (s+1)>len)
    {
        printf("Invalid input");
        return 0;
    }
    for(int i=s;i<s+l;i++)
    {
        printf("%c",message[i]);
    }
}