// editor4
// editor4
#include <stdio.h>
#include <string.h>

int main() {
    char message[1001];
    int start, length;
    scanf("%s", message);
    scanf("%d", &start);
    scanf("%d", &length);
    int msgLen = strlen(message);
    if (start < 0 || length< 0 || start+length>msgLen) {
        printf("Invalid input\n");
        return 0;
    }
    for (int i = start;i<start+length; i++) {
        printf("%c", message[i]);
    }
    printf("\n");
    return 0;
} tib