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