#include <stdio.h>
#include <stdint.h>

int main() {
    char bufA[1024];
    char bufB[1024];

    char * in = bufA;
    char * out = bufB;

    scanf("%s", in);

    uint64_t value = 0;
    while( *in ) {
        if( *in >= '0' && *in <= '9' ) {
            value *= 10;
            value += *in - '0';
        }
        else
            return -1;

        in++;
    }

    uint64_t v = value;
    while( v ) {
        out ++;
        v /= 16;
    }

    *out-- = '\0';
    while( value ) {
        unsigned digit = value % 16;
        if( digit < 10 ) {
            *out-- = digit + '0';
        } else if( digit < 16 ) {
            *out-- = digit + 'a' - 10;
        } else {
            return -1;
        }
        value /= 16;
    }

    printf("%s\n", out);

    return 0;
}