#include <stdio.h>
#include <stings.h>
int main()
{
    char message[1001];
    int s,l;
    scanf("%s",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]);
    }
    return 0;
}