#include <stdio.h>

bool IsDigit(char ch) {
    return '0' <= ch && ch <= '9';
}

int main() {
    printf("length: ");
    int len = 0;
    char ch;
    while ((ch = getchar()) != '\n') {
        if (IsDigit(ch) && len <= 55) {
            len = len * 10 + ch - '0';
        }
        else {
            printf("error\n"); return 1;
        }
    }

    if (len < 1 || len > 55) {
        printf("error\n"); return 1;
    }

    printf("char: ");
    ch = getchar();

    if (ch == '\n' || getchar() != '\n') {
        printf("error\n"); return 1;
    }

    for (int i = 0; i < 25; ++i) {
        for (int j = 0; j < i; ++j) {
            putchar(' ');
        }
        for (int j = 0; j < len; ++j) {
            putchar(ch);
        }
        putchar('\n');
    }

    return 0;
}