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

int main() {
    char message[256]; 
    int start, length;
    fgets(message, sizeof(message), stdin);

    size_t msg_len = strlen(message);
    if (msg_len > 0 && message[msg_len - 1] == '\n') {
        message[msg_len - 1] = '\0';
        msg_len--;
    }

    scanf("%d", &start);
    while (getchar() != '\n'); 

    scanf("%d", &length);

    if (start < 0 || length < 1 || start >= msg_len || (start + length) > msg_len) {
        printf("Invalid input\n");
        return 0;
    }

    for (int i = start; i < start + length; i++) {
        putchar(message[i]);
    }
    putchar('\n');

    return 0;
}