#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;
    }