#include <stdio.h>
#include <string.h>
void csort(char *src, char *dest) {
    long i = 0, j = 0, t, m, n;
        while (src[i] != 0) {
        while ( src[i]  && src[i] == ' ' ){
            i += 1;
        }
        i += 1;
        while ( src[i]  && src[i] != ' ' ){
            i += 1;
        }
        while ( src[i]  && src[i] == ' '){
            i += 1;
        }
        j += 1;
    }
    unsigned long count[j], l[j];
    i = 0;
    t = 0;
    while (src[i]) {
        while (src[i]  && src[i] == ' '){
            i +=1;
        }
        count[t] = i;
        i += 1;
        while (src[i]  && src[i] != ' '){
            i += 1;
        }
        l[t] = i - count[t];
        while ( src[i]  && src[i] == ' '){
            i += 1;
        }
        t += 1;
    }
    i = j;
    i -= 2;
    while (i >= 0) {
        t = i + 1;
        n = i;
        while ( t < j && t >=0) {
            if (l[t] < l[n]) {
                l[t] += l[n];
                l[n] = l[t] - l[n];
                l[t] -= l[n];
                count[t] += count[n];
                count[n] = count[t] - count[n];
                count[t] -= count[n];
                n = t;
            }
            t += 1;
        }
        i -= 1;
    }
    i = 0;
        t = 0;
    while ( i < j ) {
        m = count[i];
        while ( l[i] > 0){
            dest[t] = src[m];
            m += 1;
            t += 1;
            l[i] -= 1;
        }
        dest[t] = ' ';
        i+=1;
        t += 1;
    }
    dest[t - 2 + 1] = 0;

}
int main() {
    char src[100];
    gets(src);
    unsigned long i;
    if(src[0] == ' '){
        i = 1;
    } else {
        i = 2;
    }
    int j = strlen(src) - 2 + 1;
    while (j > 0) {
        if (src[j] == ' ' && src[j - 1] == ' ') {
            j -= 1;
            i += 1;
            while ( j >= 0 && src[j] == ' '){
                j -= 1;
            };
        }
        j -= 1;
        i += 1;
    }
    char dest[i];
    csort(src, dest);
    printf("%s", dest);
    return 0;
}