#include <stdio.h>
#include <string.h>
#include <ctype.h>
int create_equilateral_triangle(char *name){
    int len = strlen(name);
    if (len < 1 || len > 10){
        printf("Invalid input\n");
        return 0;
    }
    for (int i = 0; i<len;i++){
        if (isdigit(name[i])){
            printf("Invalid input\n");
            return 0;
        }
    }
    for (int i = 1; i <= len;i++){
        for (int j = i; j < len; j++){
            printf(" ");
        }
        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;
        }