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