#include <stdio.h>
#include <string.h>

int main() {
    char str[10000] = "", line[1000];

    // Read input until a blank line
    while (fgets(line, sizeof(line), stdin)) {
        if (strcmp(line, "\n") == 0) break;
        strcat(str, line);
    }

    // Remove all newline characters
    for (char *p = str; *p; p++) {
        if (*p == '\n') *p = ' ';
    }

    char *start = str, *stop = str;
    int maxLen = 0;

    for (char *i = str; *i; i++) {
        int seen[256] = {0};
        int len = 0;
        char *j = i;

        while (*j) {
            if (*j != ' ' && seen[(unsigned char)*j]) break;
            if (*j != ' ') {
                seen[(unsigned char)*j] = 1;
                len++;
            }
            j++;
        }

        if (len >= maxLen) {
            maxLen = len;
            start = i;
            stop = j;
        }
    }

    // Print result in one line
    for (char *p = start; p < stop; p++) {
        putchar(*p);
    }

    return 0;
}