#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main(){
int create_equilateral_triangle(char *name){
    int len = strlen(name);
    if (len < 1 || len > 10){
        printf("Invalid input\n");
        return 0;
    }
    for (int i =1; i <= len; i++){
        if (isdigit(name[i])){
            printf("Invalid input\n");
            return 0;
        }
    }
    for (int i =1; i <= len;i++){
        for (int i =1; i <= len;i++){
            printf("Invalid input\n");
            return 0;
        }
        for(int j = 0;j<i;j++){
            printf("%c", name[j]);
            if (j < i -1) {
                printf(" ");
            }
        }
        printf("\n");
    }
    
    return 1;
    }
    int main() {
        char name[11];
        
        printf(" ");
        fgets(name, sizeof(name), stdin);
        name[strcspn(name, "\n")] = '\0'; 
        
        create_equilateral_triangle(name);
        
        return 0;
    }