#include <stdio.h>

int main(int argc, char **argv)
{
    short hist[0x100] = {};

    for (unsigned char *pch = argv[1]; *pch; ++pch) {
        ++hist[*pch];
    }
    for (int ch = 0; ch < 0x100; ++ch) {
        if (!hist[ch]) continue;
        while (hist[ch]--) putchar(ch);
        putchar('\n');
    }
}