#include<stdio.h>
#include<string.h>

int main ()
{
    char message[1001];
    int start,length;
    
    fgets(message,sizeof(message),stdin);
    scanf("%d",&start);
    scanf("%d",&length);
    
    int n= strlen(message);
    if(message[n-1] == '\n') {
        message[n - 1] = '\0';
        n--;
    }
    if(start < 0 || start >= n || length < 1|| start + length > n) {
        printf("Invalid input");
        return 0;
    }
    for(int i = start ;i < start + length ;i++) {
        printf("%c",messge[i]);
    }
    return 0;
}