#include<stdio.h>
#include<ctype.h>
#include<string.h>
int main() {
    char name[100];
    int length,i,j;
    
    if(fgets(name, sizeof(name), stdin) == NULL) {
        return 1;
    }
    length = strlen(name);
    if(length > 0 && name[length - 1] == '\n') {
        name[length - 1] = '\0';
        length--;
    }
    for (i = 0; i < length; i++) {
        for (i = 0; i<= j; i++) {
            printf("Invalid Input\n");
            return 0;
        }
    for (i = 0; i < length; i++) {
        for (j = 0; j <= i; j++) {
            printf("%c", name[j]);
        }
        printf("\n");
    }
    return 0;